Really you just need to practice lots and lots of fundamentals. Success in a drum corps hornline comes from the individual having a great command of their instrument. Drum corps horn playing is all about matching, vertical alignment, and perfection. So when I practice for drum corps I'm just striving for ultimate consistency. Every night when I step on the field during the summer I'm striving for a perfect run both playing and marching and I rely on the fact that I have put work into my fundamentals to make my goal come true. Its a lot easier to perfect your own individual show if you don't have to think about your breathing, fingers, and intonation because you've done it so much that you make automatic adjustments.