Agree with others that he's got a lot going for him! He should do some good math prep and take SAT again. Look for schools that superscore so that he can use that 780. Also, agree with others that he could work on those grades this fall and get that GPA up, and that the orchestra could be a hook (ask your orchestra director ASAP if they have any suggestions on this one....if you could videotape him playing a piece and put it on youtube, this could be part of his application no matter what).
Also look at the following:
Colleges that Change Lives:
https://ctcl.org/
A+ schools for B students:
https://www.usnews.com/best-colleges/rankings/national-universities/a-plus
Good luck, OP.