A Question About Rock Band

A friend of mine just got Rock Band 2 for the 360. A question came to mind, which I shall pass along:

Can one get the downloadable content for Rock Band 1 on this game?

From my understanding, the downloadable content from RB1 works on RB2.

All RB1 downloadable content works on RB2 and vice-versa (part of the upshot of this being the 20 songs you can download for free for buying RB2 can be played on RB1). It’s also worth picking up a copy of RB1 second-hand as for an extra 400 MSP you can dump all but a few of the songs on there onto your hard drive for use in RB2- a process that only takes about 1.7GB.