Bop Duets Bass Clef Complete No.1-39 (vol. 1, 2 & 3) This is a duet book for low-pitched instruments (bass clef, in C). Nos. 12-39 (vol. 2-3) also include chord symbols. Perfect for lessons, practice sessions, etc. The book has been cut for self-scanning. Pencil markings have been erased. This is a used book, so there may be some stains due to aging. Please purchase only if you understand this.