You’ve asked this same question several times now and keep getting the same answer.
http://talk.collegeconfidential.com/pre-med-medical-school/2114474-m-d-m-m-or-m-d-d-m.html#latest
http://talk.collegeconfidential.com/music-major/2114323-bm-for-md.html#latest
You don’t need to be a science major to go med school, but earning a BM or BFA in music and completing med school pre-reqs and ECs may not be possible due to the time commitments required for performances & rehearsals.
A BA in music together with a strong grades in pre-reqs or combined with a science minor may work. (D1 had music composition major/biochem minor in her med school class. He did just fine.)
Coursework only gives you the background knowledge needed for the MCAT. It’s up to the student to prepare him/herself to take the actual exam.
Also, you a high school sophomore–concentrate on doing well in your high school coursework. You’re a very, very long way from applying to medical school.