What @goforth and @dbandmom have said is true. You really need to do a cost benefit analysis of the senior year and figure out what the priorities are for your kid. This was hard for us with the music kid. He wouldn’t drop anything music related (on two instruments no less), but hates most academics, even though he’s an AP-level kid with high test scores. He has three academic classes this year, two are AP. He personally couldn’t handle more with his musical commitments. Maybe some kids can.
There’s some advantage to getting college credit for some (not all) of the AP stuff, but you have to balance it with a sane senior year and quality auditions. We’ve let our son make some of the calls on this. I think he may mildly regret some of the academic choices later, but if he has to take college level courses in college, that he could have pushed forward into high school, so that he can make forward progress musically, I guess that’s ok.