I expected the game to be $20 as soon as it was announced. 25 tracks AND it works with EVERY OTHER SONG YOU HAVE? $20 is a steal just to export 25 songs, let alone there's an actual GAME to play.
Plus $20 is the limit on XBL Arcade games and this is a pretty high profile Arcade game. I totally expect this and Tony Hawk's Pro Skater HD to be $20 this summer.