Lowell Little, the great author for brass, compiled this fantastic collection of Artistic Etudes for the trumpet from a full swath of 20th century composers. I am certain some of the these are originals as well, since he is known as a formidable composer for the trumpet, and this progressive collection of studies is one of the most thoughtfully laid out artistic methods I have ever seen.
Originally published by Pro Art Music, and available here as a part of our ongoing collaboration, it was questionably released as a two part series. Instead of making you buy two books, I have put both volumes 1 & 2 together into a single two book set to make things easier and cheaper, so trumpeters everywhere can have a chance to enjoy this fantastic book.
The first study from each is available volume is available in the samples, give them a try, then grab an immediate PDF download above.