Couillaud's Improvement Studies are traditional tonal pieces that are suitable technical challenges for the improvement of articulation, slide-tongue coordination, and overall technique.
Taken from the cello works of Dotzauer, Duport, and Lee, these adaptations are beautifully idiomatic writings for the trombone that are approachable by players at all levels. Each study focuses on one technique to be mastered, like arpeggios, triplets, continuous legato style, and more.
The first study is available in the samples, but there is much more to follow if you make a purchase above.
All of these books by Couillaud have only be available in oversized European editions until now. These books are priced at 50% of retail in the hopes that they will be adopted by a growing number of players worldwide.