Sheet music search made easy
Search within results:
Delivery Method
Instruments
Genres
  • Standards
Price
Standards
7730 result(s) found
List results in: Detailed View | Thumbnail View
Sort results by: Price | Release Date | Popularity | Title
Results per page: 10 | 24 | 50
Bacharach & David - American Classics - Easy Piano. For voice and easy piano. Easy Piano Composer Collection. Pop Vocal and Vocal Standards. Difficulty: easy-medium. Songbook. Vocal melody, lyrics and piano accompaniment. 72 pages. Published by Hal Leonard (HL.316051). ISBN 0634011480. With vocal melody, lyrics and piano accompaniment. Pop Vocal and Vocal Standards. 9x12 inches. 17 songs from these pop legends, including: Alfie * (They Long to Be) Close to You * Do You Know the Way to San Jose * I'll Never Fall in Love Again * The Look of Love * Raindrops Keep Fallin' on My Head * This Guy's in Love with You * Walk on By * What the World Needs Now Is Love * Wives and Lovers (Hey, Little Girl) * and more.
$14.95

Pages: 72
Instruments: Piano, Voice, Piano and Keyboard, Vocal
Genres: Americana, Pop, Standards, Folk, Jazz & Blues
Instantly downloadable sheet music by Pablo Beltran Ruiz for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Jazz & Blues, Latin, Standards
Instantly downloadable sheet music by John Kander for voice & piano of MEDIUM skill level.
$7.99

Instruments: Piano, Voice, Piano and Keyboard, Vocal
Genres: Broadway, Standards, Musical/Show, Jazz & Blues
An American in Paris by George Gershwin (1898-1937). For alto saxophone and piano. Swiss import. Grade 3. Score and parts. Published by Editions Marc Reift (MA.EMR-2154E).
$24.88

Instruments: Piano Accompaniment, Alto Saxophone, Piano, Piano and Keyboard, Saxophone, Woodwinds
Genres: 20th Century, Americana, Standards, Classical, Folk, Jazz & Blues
Edelweiss by Rodgers & Hammerstein and The Sound Of Music (Musical). For piano, voice, and guitar (chords only). Broadway; Film/TV; Musical/Show; Standards. PV. 3 pages. Published by Hal Leonard - Digital Sheet Music (HX.35870). About Digital Print Sheet Music Digital Print is printable sheet music available anytime, anywhere. Just purchase, print and play! View your online sheet music at home, school, work or anywhere you have a computer connected to the Internet. With Digital Print, you can print your digital sheet music immediately after purchase, or wait until its convenient. And our software installation is easy - we'll guide you through the simple steps to make sure you have Adobe Flash Player, Adobe AIR and the Sheet Music Plus AIR application. Learn more
$4.99

Pages: 3
Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Broadway, Film & TV, Standards, Musical/Show, Jazz & Blues
Take Me To Your Heart Again (La Vie En Rose) by Edith Piaf. By Louiguy. For piano, voice, and guitar (chords only). Standards. 4 pages. Published by Hal Leonard - Digital Sheet Music (HX.97404). About Digital Print Sheet Music Digital Print is printable sheet music available anytime, anywhere. Just purchase, print and play! View your online sheet music at home, school, work or anywhere you have a computer connected to the Internet. With Digital Print, you can print your digital sheet music immediately after purchase, or wait until its convenient. And our software installation is easy - we'll guide you through the simple steps to make sure you have Adobe Flash Player, Adobe AIR and the Sheet Music Plus AIR application. Learn more
$4.99

Pages: 4
Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: French, Pop, Standards, World, Jazz & Blues
By Michael Feinstein. For voice, piano and guitar chords. Piano/Vocal/Guitar Artist Songbook. Vocal Standards, Traditional Pop and Adult Contemporary. Difficulty: medium. Songbook. Vocal melody, piano accompaniment, lyrics, chord names, guitar chord diagrams and introductory text. 64 pages. Published by Hal Leonard
$12.95

Pages: 64
Instruments: Piano, Vocal, Guitar, Vocal, Piano, Guitar, Voice, Piano and Keyboard
Genres: Adult Contemporary, Pop, Standards, Miscellaneous, Jazz & Blues
(Piano/Vocal/Chords). By George Gershwin (1898-1937) and Ira Gershwin. For piano, voice, and guitar (chords only). This edition: Piano/Vocal/Chords. Artist/Personality; Masterworks; Personality Book; Piano/Vocal/Chords. 20th Century; Broadway; Masterwork Arrangement. Book. 116 pages. Published by Alfred Music Publishing
$16.95

Pages: 116
Instruments: Piano, Vocal, Guitar, Vocal, Piano, Guitar, Medium Voice, Classical Guitar, Piano and Keyboard, Voice
Genres: 20th Century, Broadway, Comedy, Standards, Classical, Miscellaneous, Jazz & Blues
(Book/CD package (2 CDs)). For tenor voice solo and piano accompaniment. Vocal Collection. Vocal Standards, Classical and Play Along. Difficulty: medium to medium-difficult. 2 accompaniment CDs and collection. Vocal melody, lyrics, piano accompaniment and introductory text. 128 pages. Published by G. Schirmer
$26.99

Pages: 128
Instruments: Piano Accompaniment, Tenor Voice, Piano, Piano and Keyboard, Voice, Vocal
Genres: Classical, Standards, Jazz & Blues
Instantly downloadable sheet music by Johnny Cash for piano solo of EASY skill level.
$7.99

Instruments: Piano, Piano and Keyboard
Genres: Country, Standards, Jazz & Blues
Instantly downloadable sheet music by Wayne Thompson for piano solo of MEDIUM skill level.
$2.99

Instruments: Piano, Piano and Keyboard
Genres: Country, Rock, Pop, Standards, Love, Jazz & Blues, Miscellaneous
Instantly downloadable sheet music by Arthur Hamilton for voice & piano of MEDIUM skill level.
$7.99

Instruments: Piano, Voice, Piano and Keyboard, Vocal
Genres: Jazz & Blues, Standards
Instantly downloadable sheet music by Texas Folksong for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Americana, Folk, Standards, Jazz & Blues
By Irving Berlin. For voice, piano and guitar chords. P/V/G Composer Collection. Standards and Traditional Pop. Difficulty: medium. Songbook. Vocal melody, piano accompaniment, lyrics, chord names and guitar chord diagrams. 104 pages. Published by Hal Leonard
$12.95

Pages: 104
Instruments: Piano, Vocal, Guitar, Vocal, Piano, Guitar, Voice, Electric Guitar, Piano and Keyboard
Genres: Jazz & Blues, Standards
Instantly downloadable sheet music by Stephen Sondheim for piano solo of EASY skill level.
$7.99

Instruments: Piano, Piano and Keyboard
Genres: Broadway, Standards, Musical/Show, Jazz & Blues
Instantly downloadable sheet music by Jimmy Webb for piano solo of MEDIUM skill level.
$2.99

Instruments: Piano, Piano and Keyboard
Genres: Americana, Broadway, Country, Folk, Jazz & Blues, Rock, Pop, Patriotic, Standards
Instantly downloadable sheet music by Chris de Burgh for piano solo of MEDIUM skill level.
$7.99

Instruments: Piano, Piano and Keyboard
Genres: Pop, Standards, Love, Jazz & Blues, Miscellaneous
Climb Ev'ry Mountain by Rodgers & Hammerstein and Hal Leonard Student Piano Library. Arranged by Mona Rejino. For piano. Broadway; Film/TV; Graduation; Musical/Show; Standards. EDPNO. Big Note. 3 pages. Published by Hal Leonard - Digital Sheet Music (HX.23702). With Big Note. Broadway; Film/TV; Graduation; Musical/Show; Standards. About Digital Print Sheet Music Digital Print is printable sheet music available anytime, anywhere. Just purchase, print and play! View your online sheet music at home, school, work or anywhere you have a computer connected to the Internet. With Digital Print, you can print your digital sheet music immediately after purchase, or wait until its convenient. And our software installation is easy - we'll guide you through the simple steps to make sure you have Adobe Flash Player, Adobe AIR and the Sheet Music Plus AIR application. Learn more
$4.99

Pages: 3
Instruments: Piano, Piano and Keyboard
Genres: Broadway, Graduation, Film & TV, Standards, Musical/Show, Celebrations, Jazz & Blues
Instantly downloadable sheet music by Bart Howard for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Jazz & Blues, Standards
Instantly downloadable sheet music by Jelly Roll Morton for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Jazz & Blues, Standards
Instantly downloadable sheet music by Ralph Blane for piano solo of EASY skill level.
$7.99

Instruments: Piano, Piano and Keyboard
Genres: Christmas, Pop, Film & TV, Standards, Miscellaneous, Jazz & Blues
Instantly downloadable sheet music by Wayne Thompson for piano solo of MEDIUM skill level.
$2.99

Instruments: Piano, Piano and Keyboard
Genres: Country, Pop, Standards, Love, Jazz & Blues, Miscellaneous
Instantly downloadable sheet music by Miscellaneous for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Folk, Patriotic, Standards, Jazz & Blues
Instantly downloadable sheet music by Bernard Herrmann for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Film & TV, Standards, Jazz & Blues
Instantly downloadable sheet music by Richard Rodgers for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Standards, Love, Musical/Show, Jazz & Blues, Miscellaneous, Broadway
Long Ago (And Far Away) by Jerome Kern. For piano. Film/TV; Jazz; Love; Standards. Big Note. 2 pages. Published by Hal Leonard - Digital Sheet Music (HX.33376). With Big Note. Film/TV; Jazz; Love; Standards. About Digital Print Sheet Music Digital Print is printable sheet music available anytime, anywhere. Just purchase, print and play! View your online sheet music at home, school, work or anywhere you have a computer connected to the Internet. With Digital Print, you can print your digital sheet music immediately after purchase, or wait until its convenient. And our software installation is easy - we'll guide you through the simple steps to make sure you have Adobe Flash Player, Adobe AIR and the Sheet Music Plus AIR application. Learn more
$4.99

Pages: 2
Instruments: Piano, Piano and Keyboard
Genres: Film & TV, Standards, Valentine's Day, Jazz & Blues, Celebrations
Summertime by George Gershwin (1898-1937). For piano and voice. Vocal Music. Single sheet. Published by Carisch Edition (M7.ML-2218). ISBN 978-88-507-0214-5. Neu von Carisch: der Klassiker "Summertime" von Gershwin.
$12.95

Instruments: Piano, Voice, Piano and Keyboard, Vocal
Genres: Standards, Jazz & Blues
Fake Book Of The World's Favorite Songs - C Instruments - 4th Edition. (C Edition). By Various. For voice and C instrument. Hal Leonard Fake Books. Traditional Pop and Vocal Standards. Difficulty: medium. Fake book. Vocal melody, lyrics and chord names. 424 pages. Published by Hal Leonard (HL.240072). ISBN 0881888796. With vocal melody, lyrics and chord names. Traditional Pop and Vocal Standards. 9x12 inches. The Fake Book of the World's Favorite Songs - 4th Edition is a must-own collection of more than 735 songs arranged with melody line, lyrics and guitar chord frames. It features a wide variety of songs, including singalongs, Christmas songs, classical themes, marches and patriotic songs, polkas, inspirational and sacred tunes, international folksongs, and many more. About Hal Leonard Fake Books A "fake book" contains songs written in a concise format that includes only the melody and chords, letting you interpret the song's performance as you feel is appropriate. This is great for quickly learning songs by yourself or with an ensemble. Each song in a fake book only has a single melody actually written out in notes, which is usually the vocal or lead melody. This melody will have the lyrics written beneath the notes, with each word aligned to its corresponding note. Above the notes of the melody will appear the names of the appropriate chords to play - for example, a "C minor" chord would be written as "Cmin" or Cm", rather than writing out all of the notes in those chords as they appeared in the original version of the song. This format is very compact, which is why you will often see fakebooks containing 500 or more songs.
$18.36

Pages: 424
Instruments: Piano, Voice, Piccolo, Oboe, Recorder, Violin, Electric Guitar, Piano and Keyboard, Vocal, Flute, Woodwinds, Strings, Guitar
Genres: Pop, Standards, Jazz & Blues
Instantly downloadable sheet music by Richard Rodgers for piano solo of MEDIUM skill level.
$7.99

Instruments: Piano, Piano and Keyboard
Genres: Broadway, Children, Film & TV, Standards, Musical/Show, Miscellaneous, Jazz & Blues
Instantly downloadable sheet music by Cole Porter for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Jazz & Blues, Standards, Musical/Show, Broadway
Gershwin Preludes by George Gershwin (1898-1937). Arranged by James Cohn. For Bb clarinet solo and piano accompaniment. Masterworks; Solo; Woodwind - B-Flat Clarinet Solo. 20th Century. Difficulty: medium-difficult. Piano/clarinet single (Includes separate pull-out clarinet part). Solo part and piano accompaniment. 20 pages. Published by Alfred Music Publishing (AP.IF0283). ISBN 0769278019. With solo part and piano accompaniment. 20th Century. 9x12 inches. Solo for clarinet with piano accompaniment. Written by George Gershwin and arranged by James Cohn.
$14.95

Pages: 20
Instruments: Piano Accompaniment, B-Flat Clarinet, Piano, Piano and Keyboard, Clarinet, Woodwinds
Genres: 20th Century, Standards, Classical, Jazz & Blues
The Young Pianist's Library, Book 14B (Gershwin Recital Pieces). By George Gershwin (1898-1937). Arranged by Denes Agay. For Piano. Masterworks; Method/Instruction; Piano Collection. The Young Pianist's Library. 20th Century; Masterwork Arrangement. Early Intermediate. Book. 24 pages. Published by Alfred Music Publishing (AP.DA0042). ISBN 0897242599. 20th Century; Masterwork Arrangement. Rhapsody in Blue * An American in Paris * The Man I Love * But Not for Me * Oh Lady Be Good * Strike Up the Band * Who Cares (So Long As You Care for Me).
$6.95

Pages: 24
Instruments: Piano, Piano and Keyboard
Genres: 20th Century, Standards, Classical, Jazz & Blues
George Gershwin Medley by George Gershwin (1898-1937). Edited by Bob Dingley. Arranged by Bill Holcombe. Choir Secular. For SSA choir and piano accompaniment (Women's Choir). Choral Octavo; Masterworks. Pop choral octavo. Choral, Standards and 20th Century. Octavo. Chord names. 28 pages. Published by Alfred Music Publishing (AP.CMM00004). With chord names. Choral, Standards and 20th Century. 9x12 inches. This wonderful medley of George Gershwin titles includes: I Got Rhythm, Fas cinating Rhythm, Someone to Watch Over Me, 'S Wonderful, Who Cares?, Bidin' My Time, and Strike Up the Band! The unique arrangement for SSA offers chi ldren's choirs as well as women's groups an opportunity to sing Gershwin at his best.
$3.50

Pages: 28
Instruments: Choir, Piano Accompaniment, Vocal, Piano, Piano and Keyboard
Genres: 20th Century, Standards, Classical, Jazz & Blues
Instantly downloadable sheet music by Barbra Streisand for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Broadway, Standards, Musical/Show, Jazz & Blues
Sixteen Going On Seventeen by Richard Rodgers and The Sound Of Music (Musical). For piano. Film/TV; Jazz; Musical/Show; Standards. Piano. 4 pages. Published by Hal Leonard - Digital Sheet Music (HX.23096). About Digital Print Sheet Music Digital Print is printable sheet music available anytime, anywhere. Just purchase, print and play! View your online sheet music at home, school, work or anywhere you have a computer connected to the Internet. With Digital Print, you can print your digital sheet music immediately after purchase, or wait until its convenient. And our software installation is easy - we'll guide you through the simple steps to make sure you have Adobe Flash Player, Adobe AIR and the Sheet Music Plus AIR application. Learn more
$4.99

Pages: 4
Instruments: Piano, Piano and Keyboard
Genres: Film & TV, Standards, Jazz & Blues
By Various. For solo piano. Piano Solo Songbook. Standards. Difficulty: medium. Songbook. Standard notation and fingerings (does not include words to the songs). 80 pages. Published by Hal Leonard
$9.95

Pages: 80
Instruments: Piano, Piano and Keyboard
Genres: Film & TV, Standards, Jazz & Blues
Instantly downloadable sheet music by S.K. Russell for piano solo of EASY skill level.
$7.99

Instruments: Piano, Piano and Keyboard
Genres: Latin, Standards, Jazz & Blues
Instantly downloadable sheet music by Francesco Paolo Tosti for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Classical, Standards, World, Jazz & Blues
Instantly downloadable sheet music by Shirley Eikhard for piano solo of EASY skill level.
$7.99

Instruments: Piano, Piano and Keyboard
Genres: Rock, Pop, Standards, Jazz & Blues
Instantly downloadable sheet music by Richard Rodgers for voice & piano of MEDIUM skill level.
$7.99

Instruments: Piano, Voice, Piano and Keyboard, Vocal
Genres: Film & TV, Standards, Wedding, Love, Musical/Show, Jazz & Blues, Celebrations, Miscellaneous, Broadway
Instantly downloadable sheet music by Cole Porter for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Jazz & Blues, Standards
Porgy and Bess (Vocal Selections). (Piano/Vocal). By George Gershwin (1898-1937) and Dorothy Heyward. For Keyboard; Piano; Voice. This edition: Piano/Vocal. Masterworks; Piano/Vocal/Chords; Shows & Movies. 20th Century; Broadway; Masterwork Arrangement. Book. 80 pages. Published by Alfred Music Publishing (AP.30451). ISBN 0739053655. 20th Century; Broadway; Masterwork Arrangement. Enjoy historical photos supplied directly from the Gershwin estate and a dozen of the best vocal selections from Porgy and Bess, all professionally arranged for Piano/Vocal and complete with detailed information on the musical as well as each song in this classic collection.Titles: Summertime * A Woman Is a Sometime Thing * My Man's Gone Now * Leavin' fo' de Promis' Lan' * It Take a Long Pull to Get There * I Got Plenty o' Nuttin' * Bess, You Is My Woman Now * It Ain't Necessarily So * What You Want Wid' Bess * I Loves You Porgy * A Red Headed Woman * There's a Boat Dat's Leavin' Soon for New York.
$16.95

Pages: 80
Instruments: Piano, Vocal, Guitar, Vocal, Piano, Guitar, Voice, Organ, Piano and Keyboard
Genres: 20th Century, Broadway, Film & TV, Standards, Classical, Jazz & Blues
Summertime (5) by George Gershwin (1898-1937). Arranged by Jerome Naulais. For 3 Euphoniums & Piano (Keyboard). Swiss import. Original Composition. Grade 3. Score and parts. Published by Editions Marc Reift (MA.EMR-4290).
$31.67

Instruments: Piano, Organ, Euphonium, Piano and Keyboard, Brass
Genres: Standards, Jazz & Blues
Goodbye by Benny Goodman, Dinah Washington, and Rosemary Clooney. For piano, voice, and guitar (chords only). Jazz; Pop; Standards. 3 pages. Published by Hal Leonard - Digital Sheet Music (HX.15298). About Digital Print Sheet Music Digital Print is printable sheet music available anytime, anywhere. Just purchase, print and play! View your online sheet music at home, school, work or anywhere you have a computer connected to the Internet. With Digital Print, you can print your digital sheet music immediately after purchase, or wait until its convenient. And our software installation is easy - we'll guide you through the simple steps to make sure you have Adobe Flash Player, Adobe AIR and the Sheet Music Plus AIR application. Learn more
$4.99

Pages: 3
Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Pop, Standards, Swing, Jazz & Blues
Momentos by Andrea Bocelli and Julio Iglesias. For piano, voice, and guitar (chords only). Classical; Latin; Pop; Standards. 6 pages. Published by Hal Leonard - Digital Sheet Music (HX.42024). About Digital Print Sheet Music Digital Print is printable sheet music available anytime, anywhere. Just purchase, print and play! View your online sheet music at home, school, work or anywhere you have a computer connected to the Internet. With Digital Print, you can print your digital sheet music immediately after purchase, or wait until its convenient. And our software installation is easy - we'll guide you through the simple steps to make sure you have Adobe Flash Player, Adobe AIR and the Sheet Music Plus AIR application. Learn more
$4.99

Pages: 6
Instruments: Piano, Voice, Acoustic Guitar, Classical Guitar, Piano and Keyboard, Vocal, Guitar
Genres: Classical, Adult Contemporary, Latin, Standards, Miscellaneous, Jazz & Blues
Edelweiss by Rodgers & Hammerstein and The Sound Of Music (Musical). For piano, voice, and guitar (chords only). Broadway; Film/TV; Musical/Show; Standards. PV. 2 pages. Published by Hal Leonard - Digital Sheet Music (HX.47251). About Digital Print Sheet Music Digital Print is printable sheet music available anytime, anywhere. Just purchase, print and play! View your online sheet music at home, school, work or anywhere you have a computer connected to the Internet. With Digital Print, you can print your digital sheet music immediately after purchase, or wait until its convenient. And our software installation is easy - we'll guide you through the simple steps to make sure you have Adobe Flash Player, Adobe AIR and the Sheet Music Plus AIR application. Learn more
$4.99

Pages: 2
Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Broadway, Film & TV, Standards, Musical/Show, Jazz & Blues
By Bud Green, Les Brown, and Ben Homer. For voice, piano and guitar chords. Piano Vocal. Big Band and Standards. Difficulty: medium. Single. Vocal melody, piano accompaniment, lyrics, chord names and guitar chord diagrams. 4 pages. Published by Hal Leonard
$3.95

Pages: 4
Instruments: Piano, Vocal, Guitar, Vocal, Piano, Guitar, Voice, Piano and Keyboard
Genres: Standards, Jazz & Blues
Swinging on a Star arranged by Greg Gilpin. For 2-part chorus and piano accompaniment (Unison/2-part). Shawnee Press. Standards. Difficulty: easy-medium. Vocal score. Vocal score notation, choreography notes and piano accompaniment. 9 pages. Duration 2m35s. Shawnee Press #EA0202. Published by Shawnee Press (HL.35022285). With vocal score notation, choreography notes and piano accompaniment. Standards. 6.75x10.5 inches. Acquaint your students with music from the '40s and introduce swing style at an early age! This is a fun novelty number with lots of staging possibilities. Take advantage of the choreography ideas included at the end of the octavo. Add some costumes if you'd like, and create a magical performance.
$1.79

Pages: 9
Instruments: Choir, Voice, Piano Accompaniment, Vocal, Piano, Piano and Keyboard
Genres: Standards, Jazz & Blues
Instantly downloadable sheet music by Jerome Kern for voice, piano and guitar of MEDIUM skill level.
$7.99

Instruments: Piano, Guitar, Voice, Piano and Keyboard, Vocal
Genres: Standards, Jazz & Blues
Instantly downloadable sheet music by Frank Sinatra for voice & piano of MEDIUM skill level.
$7.99

Instruments: Piano, Voice, Piano and Keyboard, Vocal
Genres: Jazz & Blues, Film & TV, Standards