Muse an alternative band formed in the late nineties. They consult of Matt (the singer/guitarist/pianist) Dom (the drummer) and Chris (the bassist) Together they have put out 5 albums, first being Showbiz, the Origin Of Symmetry, the Hullabaloo, then Absolution, then Black Holes and Revelations. If you have heard the song Time Is Running Out, Starlight, Super Massive Black Hole, or Knights of Cydonia, that is Muse.
of course there are so many great songs out there that I was just begenning to scrape the surface
Also, if you have the track Hysteria on Rock Band, then that is by Muse.
I hope this helped you, have a nice day
edit: ninja'd? really? well, TakeABow has beat me to it