Just got Rock Band 2 earlier this week (with all the new instruments!), and we’ve been playing it like crazy.  I’m hooked on this one song that was recently released as a downloadable, The Cab - One Of Those Nights.  Featuring Brendon Urie (of Panic at the Disco) and Patrick Stump (of Fall Out Boy).  Damn catchy.  I’m definitely going to like how Rock Band will let me discover new music just from playing new songs that come out.

Edit: Youtube link changed cuz stupid record companies took down the old one.