Play.com is offering 1.3 million MP3 music tracks for download free of DRM (Digital Rights Management) copyright restrictions, so they'll play on any portable music device.
The online retailer has just launched its PlayDigital service in an attempt to break Apple's stranglehold on the digital download market with iTunes.
Play.com claims its site is better value than Apple's iTunes store, with its top 100 tracks available for 65p, compared with 79p on iTunes.
Other single tracks cost 70p, and popular albums will cost £6.99, compared to iTunes's £7.99.
However, Apple has already been forced by the European Commission to bring its UK prices in line with the rest of Europe. It's expected to cut the cost of a single track on iTunes from 79p to 74p.