My friend, Joelle, uploaded the 2008 Grammy Awards tribute to the Beatles in her Multiply Site. It's sort of an interpretative dance of Cirque du Soleil. It's definitely something to watch AND hear (that kid can sure sing).
Check out her Video portion. She has other Grammy performances uploaded there.
Watch Tina Turner and Beyonce's performance. Amy Winehouse is something to watch too. Oh, and Andre Bocelli and Josh Groban!