Brand new Rock Band downloadable content just became available on the Xbox Live Marketplace this morning as three rockin' tracks get added to the ever growing DLC library. Rockin' tracks from Sonic Youth, The Clash and Blondie to be exact with each costing a cool 160 Microsoft points. Check the break for a complete breakdown of today's Rock Band DLC. Also, we wanted to say that we're glad to see master tracks becoming the norm in Rock Band DLC offerings. The days of cover song DLC are all but gone ... three cheers for that!