I agree that it depends upon the school, but I know many around here that are involved in both HS music and sports. I don't know anyone who does both at a high level, though it may depend upon what you consider a high level.
Eldest did HS band for all 4 years (band is in school, mostly, and all must participate year round, so marching band and concert band). She was section leader for clarinets senior year and auditioned for and made her college symphonic band. But she isn't a great musician.
She also played softball, both HS and travel. She was better at softball than music - had interested DIII coaches and made HS all-state honorable mention junior year.
Middle kid stopped band after MS. Probably a better musician than eldest, but she just hated band. Plays two varsity sports, fall and spring, and plays travel in one sport. Does some other activities too (as did eldest - was in Model UN and was involved in some clubs). She has friends in her fall sport that are in band, and so they rush from games to march. It can be done, but perhaps not at a high level.
Don't know if it is because it is tough to excel in a sport and music, but a lot of the band kids have no understanding of football. Eldest could not understand how the band kids could sit through 4 years of football games and not comprehend the basic rules of the game. I'm sure they could have figured it out - these were academic competition all-stars, NMF, etc. Maybe there isn't that much interest in both football and music, though our HS has a few football players that also are in band - some have even marched at halftime.
