Erik Veldkamp has always found it very helpful to practice duets, because you have to play in time (and in tune) and listen to each other. For students this is vital to their progress.
This book contains 20 full-length duets written in a jazz style, helping students refine their inflection and articulation in an ensemble setting. Each duet is based on a well-known standard that will assist in developing your jazz repertoire. The entire book is written in bass clef, making it appropriate for intermediate to advanced players.
The first duet is provided in the samples. Take a look to the left, and then click above for a complete PDF download.