Intonation Studies
Intonation Studies for Three Trombones consists of 70 pages of intonation exercises for an orchestral trombone section. This book distinguishes itself from similar resources by helping trombonists learn to work in the environment they most often encounter: performing with each other. Rather than providing a CD for private practice or describing abstract principles, it addresses the issues that orchestral musicians deal with on a daily basis. From the common chord voicings at the beginning to the annotated orchestral excerpts at the end, every exercise is directly applicable to standard orchestral repertoire.
Free sheet music
The following pieces are available for free download under a Creative Commons license.
Trombone and Piano
Debussy: Beau soir
Debussy: La fille aux cheveux de lin
Dorsey: Trombonology
Brass Ensembles
Bach Chorales
Bach chorales are a popular way to warm up a section or ensemble. I've transposed 384 of Bach's harmonizations into trombone range and compiled them into A Trombonist's Hymnal, comprised of two volumes.