…sales of Guitar Hero and Rock Band brought in more revenue in 2007 than digital music downloads from services like iTunes. The two videogame franchises made their respective publishers $935 million USD combined, while digital music sales came in at about $835m.
— <a href="http://www.primotechnology.com/2008/01/28/rock-band-guitar-hero-sales-outperform-digital-music-sales-in-2007/">Primotech</a> (via <a href="http://go.gtmcknight.com/">gtmcknight</a>)