<p>First of all, not all schools accept the arts supplement so before you go thorough the trouble make sure that the schools that interest you do.</p>
<p>If you have a particular artistic talent and don’t have another means to convey this to the school, then I would say it’s worth the trouble.</p>
<p>In terms of how “good” you need to be, that’s obviously a judgment call but if your good enough that you think it will help your application, then I would say go ahead.</p>
<p>My son is a musician and he did submit the arts supplement (he was applying to “regular” colleges, not music conservatories which have their own audition processes, etc.).</p>