What to practice? Hal has some great thoughts. Twelve minutes of wisdom from a modern master.
If you are a classical artist, substitute classical sounds for jazz sounds. It's all the same.
"art is supposed to teach yourself something about yourself you didn't know" Hal Galper
You've got to learn your instrument. Then, you practice, practice, practice. And then, when you finally get up there on the bandstand, forget all that and just wail.
I'm a professional pianist and music educator in West Toronto Ontario. I'm also a devoted percussionist and drum teacher.