On CBS-owned Last.fm, users can now play complete songs from the Big Four record labels and 150,000 indie labels at no cost up to three times, reports MediaBuyerPlanner.

When users visit Last.fm to listen to a song, an ad appears on-screen. If a song is accessed more than three times, the user is redirected to iTunes, Amazon or other music vending sites.

President Quincy Smith of CBS Interactive said the online music site is "aggressively adding content" to an existing cache of 3.5 million songs.

Last.fm reports 15 million active users in 200 countries. Most are located in the US and the UK. According to The Times, the site enables users to share interests with a process called "scrobbling."

In addition to single-song streams, users can stream complete albums three times on a try-before-you-buy basis.

No download is required to use the service.