The Rock Band series of music video games supports downloadable songs for the Xbox 360, PlayStation 3, and Wii versions through the consoles' respective online services.
Screaming for Vengeance by Judas Priest was the first available Rock Band album, released on April 22.
Some songs released before Rock Band 3 have been retrofitted to include Rock Band 3 features, including backing vocals, and the ability to buy an additional pack for Pro Guitar/Bass charts without having to buy the "RB3 Version" of the song.
Starting October 26 (with The Doors), all new songs are only playable in Rock Band 3, due to a change in the file format.
All songs released via downloadable content are playable in Rock Band 3, and support its new Pro Drum mode.