Can I buy downloadable content [DLC] for Lego Rock Band?

It's great to hear that you're enjoying Lego Rock Band. You'll be happy to know that there is indeed DLC available for Lego Rock Band.

Fans can extend their LEGO Rock Band experience with downloadable content that can be purchased through the LEGO Rock Band store. Players will have access to all of the songs in the Rock Band Music Store that have been identified to be suitable for all ages. Those cleared songs are the only tracks that will appear within the LEGO Rock Band store for purchase.