It depends on the high school, too. My kids both went to a small, private, independent K-12 school. Less than 75 kids/graduating class. Kids HAD to do more than one thing so they could field teams and ensembles, and it was sort of part of the DNA of the school for them to do so. Coaches and teachers were pretty accommodating. One of my kids was captain of the volleyball team and in choir (and a state level competitor in speech, Girl Scout Gold Award recipient, founded the library club, and was in Amnesty International). Younger was a club fencer (top 5 in state), in choir, top Quiz Bowler in our state, in Robotics, entomologist, and an accomplished artist.
But at a big high school where there is a lot of competition for spots on the sports teams, it is harder. Kids really have to play their sports year around. If your kid is interested in marching band in particular, they should probably play a sport that is not a fall sport (more conflicts during football season).
