Key to uptake in the US, which it sees as its priority market, was closer integration of Last.fm with parent company CBS's radio stations. CBS acquired Last.fm in May 2007 for $280m (?185m), giving the UK-based music streaming and discovery service an important foothold in the world's biggest music market.

CBS Interactive Music Group VP of product Fred McIntyre says, "We've seen really good organic growth in the US. In January 2009, we had 3m uniques. In January 2010, we ...