MTV Games and EA today announced that the Rock Band franchise has officially surpassed $1 billion in North American retail sales in 15 months, citing figures by the NPD Group. In addition, over 40 million paid individual songs have been sold via download through the online platform; there are a total of 600 songs available in the catalog.
Rock Band was launched back in November 20, 2007 and has sold millions of units. Its sequel was released earlier last year and built upon the original. The franchise is the first to start full album downloads on PS3 and Xbox 360, which quite a few bands have taken advantage of, including Judas Priest, Foo Fighters, Megadeth and Rush.