Rock Band sales exceed $1bn in US

Sales of the Rock Band series have exceeded the $1 billion mark in North America, after only 15 months of being on sale.

The figures come from MTV Games, citing figures from NPD Group. In addition, over 40 million tracks have been downloaded and purchased for the title.

Viacom, which owns MTV Games, said the Rock Band franchise had shipped 10 million units since the series' November 2007 debut.

According to NPD, Rock Band was North America’s number one title of 2008 in value terms.