IGN wrote:
July 14, 2008 - Last year, Rock Band was the only music game that enabled users to play as a full-fledged band. Things are different this year with Konami's Rock Revolution and, more dauntingly, Guitar Hero World Tour. Ultimately, no amount of features or new equipment is going to matter. The real winner will be whichever game has the best track list. Harmonix and MTV must be fully aware of this fact, because today, the two released the full 84-song set list. Judging by the impressive list, Konami and Activision have reason to worry. This is easily the greatest assemblage of music in a game to date.
http://xbox360.ign.com/articles/888/888781p1.html
Full list o' tracks there.
Really looking forward to The Trees from Rush, Spoonman from Soundgarden and Chop Suey from System of a Down