Drum Sessions Book 1-Book Only by Peter O'Gorman. General/guitar. For drum set. Cont. Combo Series. Book A,1. Music book. Published by Neil A. Kjos Music Company (KJ.151D). ISBN 849729009. The Kjos Contemporary Combo Series is a series of four individual beginning instruction books for Keyboard, Guitar, Bass, Guitar, and Drums (drum set). No musical knowledge necessary!The Books have been miraculously devised so students study their own individual instrument until a "Session" sign appears in their book. Then students on all Combo Instruments can play together and "Jam" to their hearts content. What a great opportunity ... perform in a Combo from the very start! What a motivational tool for studio teachers.