Alright ... there's "Bark at the Moon" on expert, and then there's "The Swan" by the Berliner Philharmoniker's number one asskicking cellist, whomever that is. Considering that success in this genre involves at least knowing the major riffs before you play it, I'm thinking that this flash game is more difficult by half than anything Guitar Hero or Rock Band has ever cooked up.
The game helpfully advises us that there are "one million possibilities to get tones from a cello." I am definitely expert on the first: a sphincter-clenching, fingernails-against-the-chalkboard grind.
Post your high scores in the comments. I can get to about 455 points before I start writing apologies to everyone who has ever handled this graceful instrument.
Cello Challenge [Berliner Philharmoniker, via Reddit]