There is an extensive tour mode on realistic stages throughout the world, which you can also play online.
There is also a Drumtrainer with prefabricated beats in a freely selectable speed and a freestyle mode.
But the main argument for the game are now 500 songs that you can download for each 1.50 and which are integrated into the tour mode. Among them will be really good music such as albums by "The Who", "Rush", "Foo Fighters", "Megadeth", "Judas Priest" and many individual songs of famous artists.
I've gotten more than 100 and not enough :)
The game is of course to several most fun.
The first Guitar Hero parts have brought me earlier on to learn guitar ... by RB2 I am now on the verge to purchase me a real drums ^^
Anyone between Guitar Hero: World Tour will decide and Rock Band 2 should engage in any case to the latter.
The game as a whole is more designed for fun and has something to offer the download contents much longer.
The quirks the RB1 had been repaired in RB2.
When it comes to instruments or to plastic drums, I would advise to GHWT Bundle or the ION Drum Rocker (expensive). Who in terms of stability and reliability in the lead.
So then! Rock On!