I have returned from the dead everyone (not that anyone has remembered me) to create a thread on Rock Band, it's sequel, and the countless songs that can be downloaded.
Why is the thread called "Rock Band Platform?" Because in Rock Band 2 all downloadable songs from the first game work with it and vice-versa, as well the ability to transfer the first games songs over thus making the game a "Platform" of sorts
Rock Band 2 comes out in 11 days on the Xbox 360, a month on the PS3, and two months on Wii and PS2.
The soundtrack for Rock Band 2 consists of a multiple range of popular and not-so-popular hits from big-name artists such as Judas Priest, Elvis Costello, Pearl Jam, Jethro Tull, Squeeze, Bon Jovi, Talking Heads, and Megadeth.
The biggest hyped songs include AC/DC and Bob Dylan making their first appearances in these games and Guns N' Roses releasing a song off Chinese Democracy (an album that's been in the works for 15 years).
New features include better instruments, online World Tour as well as single player World Tour plus Tour Challenges. But overall it looks like a much bigger improvement.
There will still be new downloadable content every week and Harmonix has stated they will reach 500 songs by the end of the year as a whole.
For a List of Songs for each game click the below links.
First Game - http://en.wikipedia.org/wiki/List_of_songs_in_Rock_Band
Second Game - http://en.wikipedia.org/wiki/List_of_songs_in_Rock_Band_2
Downloadable Tracks - http://en.wikipedia.org/wiki/List_of_downloadable_songs_for_the_Rock_Band_series