Gallay’s 22 Exercises has a bit of a misleading title. I would consider these etudes or studies more than I would consider them exercises. I consider an etude to have musicality and not just technique, expression and style, and nuance beyond just finger facility. This book has it all and then some. If you are fan of his other books (that you can see here) this book is a must have for your collection. Suitable for all horn, trumpet, and treble clef brass players.
Play through the first bit in the samples then grab an immediate PDF download above. Enjoy!