Sure, submit a supplement but please keep this story in mind: Several years ago, a tippy-top student I know (96.5 unweighted GPA from a feeder high school with a 2300 SAT) applied to HYP. Ever since the age of 5 or 6, he had been playing the piano and had performed solo at Carnegie Hall during his high school years. When he sent in his college applications, he also submitted a top-notch music supplement, but to no avail. He was rejected from HYP – even though he was accepted to Juilliard, Oberlin and Curtis for music. Bottom line: No matter how wonderful your musical talents, if admissions doesn’t want you, your musical ability will not kick you over the fence. Best of luck to you!