Here's Rachel performing the Tempest Piano Sonata (8 years old?) and the 'Rage over a Lost Penny' Op.129:
Not bad at all!
Kevin Weng (8) performs Sonata op 49. No. 2, 1st mvt at the Wonder-child competition:
Beethoven's Horn Sonata In F, Op.17 (1800) by 12 year old Jeffrey:
This one however, is of 4-year old Jonathan "conducting" Beethoven's 4th movement to the 5th Symphony - it's more on the cute side, but I have to admit his baton technique is pretty exciting - who knows, he could be the next Bernstein...
Finally here's a pretty humorous short film set to the first movement of the Serioso quartet Opus 95: