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"That's a lot of dollars. Also? A lot of M&amp;ouml;tley Cr&amp;uuml;e. Seriously, people, calm down. As of right now Rock Band has 614 songs on offer, 269 different artists, 11 full albums, more revenue than any other game in 2008, $1 billion total in North American retail sales, 40 million tracks sold, and unhindered wallet access to countless deluded human beings who think they're rock stars."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2009/03/26/rock-band-ticks-off-40-million-tracks-sold-1-billion-in-revenu/>