Not unless you're on the Wii platform. PS3 and Xbox 360 owners can only access the 20 free bonus track pack from RB2 from using the code on the back of the RB2 manual. Those songs have never been released independently, and it's unlikely that they ever will at this point. The Wii platform is a little different, since all of those songs appear as free 0-point songs in the RB2 store.
Which was done because at the time, there was no Input Code system put into the game nor could it be patched as we all know.
My DLC: http://dlcquickplay.com/user/gm439
My GT: i K e v i n Y
Me and Cipher are pals
Jibs has an awesome taste in music