26 New Etudes for Trumpet: In 13 major and 13 minor keys with scales & arpeggiosA companion book to: "Concert Duets for Trumpet" Words from the author: It is important that aspiring musicians become fluent in all of the major and minor keys. When I was a student, I was never entirely satisfied with the few choices of resources that contained well written etudes in all keys. There have been some attempts but many of them have some standard keys missing, others are purely technical and lacking in musicality. Others were too high or