Social music site Last.fm, bought in May for $280m (£140m) by CBS Corporation, has signed a deal with the Sony BMG record label. The partnership will give the service"s 20 million users access to the entire Sony catalogue of music, including songs by the Foo fighters, Kings of Leon and Natasha Bedingfield. Started in 2002, the new deal will make Last.fm the largest web radio service the world, according to the company. "We"ve always aimed to have everything ever recorded available to listen to on our site, and having access to Sony"s collection of some of the world"s most popular music takes us another huge step closer," said Martin Stiksel, co-founder of Last.fm.