<p>Carefully check the admissions websites for all schools you are applying to for specific supplement requirements. My S did not use the common app supplement option for any of the schools he applied to, but perhaps there are some for which it would be applicable–again, only if they do not have separate instructions on their website. (I’m pretty sure the Ivies, which you indicated you’re applying to, each have separate submission procedures for supplemental materials.) When in doubt, contact Admissions and ask before sending anything or using the common app. You want the supplement to be something that will strengthen your application, making sure that you follow proper procedures for submission to provide the best opportunity for it to be actually listened to. And, for the Ivies, it won’t be sent along to the music department if the application itself is not strong.</p>