30 Seconds to Mars performed on the Tonight Show with Conan O'Brien last night (Dec. 10). They performed "Kings and Queens," the first single off their new album "This is War." This is by far the best I've heard the singer sound during any late night talk show performance I've seen, going back to 2002. By the way, the three drummers you see to the right are Street Drum Corps, who are amazing on their own. The performance also features a string section and background choir.
If you don't have a Hulu account or that video stops working, you can also see it on youtube.
(Side note: AOL Radio named "The Kill" the top alternative song of the decade. Nice, although this list is pretty sketchy.)