A Danish ISP has announced a new service to offer unlimited free music downloads. The new service will offer tracks with DRM restrictions that will expire 30 days after a user’s Internet connection has been terminated.

TDC unveiled the service, called PLAY, and offered the new product to existing broadband and mobile customers. EMI, Sony BMG and Warner are all on board, so the library of free music downloads will be rather substantial.

A number of Danish record labels are also on board to offer music downloads of indie music. More than one million tracks will be available for legal MP3 downloads, including the likes of Bruce Springsteen and Robbie Williams.

Users will be able to download all the music they want, for free – so long as they stay subscribed to TDC. Looks like a pretty good deal and this is surely a business model that other ISPs around the world will start to adopt.