<p>sherlock, I would proceed with the supplement NOW. They usually want them earlier so as to have time to assess them. Remember that schools typically only want about 10 minutes of music. You should send it to ALL of the schools you are applying to if they accept a supplement. </p>
<p>Where else are you planning to apply/have applied? I’m serious about Yale: they have very high profile groups to recruit for, and it is much more intense than at other schools, I think. If you made All-State in a state like New York and are an alternate regionally, you must be good.</p>