My copy of Jack Gale's "12 Jazz Duets" arrived yesterday, ordered from Hickeys (who don't seem to let me link directly to a product). I believe this book is also available for trumpet and maybe even a few other instruments with the same arrangements transposed. I was pleasantly surprised; I was having so much fun I was up till after midnight with the good old Silent Brass!
It includes 12 Duets with a playalong CD; there are two copies of each track, one with both parts, one on the left and one on the right channel, and another copy with just the backing changes. Gale's playing is impeccable and his phrasing and styling are worth trying to emulate. At the tempos on the CD things get pretty hectic, here is a sample of one of the more straight forward blues. The duets move from blues through to rhythm changes, scatting, bop and post bop lines in a variety of normal keys.
It's a great work out for probably an advanced amateur. I think this is a great stepping stone into working on more advanced lines like you would find in a J.J solo transcription book or similar. Personally I think going in cold with those transcriptions is a bridge too far for most people; he wasn't considered a genius because he stuck with the lines and ideas that the aforementioned advanced amateur can keep up with! However, if you could pull off the juicy bits of this book in a few different keys you would be well an truly on your way to making the next step.