Since the OP is a cellist, let me give a cellist example. [url=http://www.hcs.harvard.edu/~bachsoc/sasha.html]This[/url] guy was 2 years ahead of me in HS and is currently a junior at Harvard doing dual-degree with NEC. He used to have some solos on Youtube, but it looks like he’s taken them down. However there may be examples of his solos elsewhere. Anyway, if you’re at his level, you should certainly submit a supplement.