Napster has launched a new free-to-listen music service to supplement its fee-based offerings.

Available initially in the US, the company now offers an ad-supported free music service that lets fans listen to any track up to five times at no charge, using a web-based music player.

Music fans must register to access the music, using a valid email address. It works with Macs, PCs and Linux machines.

The company also revealed details of two new community-focused features: NapsterLinks and Narchive.

NapsterLinks lets users add links to free Napster music to emails, instant messages, blogs and websites. Clicking on a link launches the song on Napster's website and music player.

The Narchive will be a music networking site to which users contribute content, including stories and images. The company is pre-populating this area with artist bios and images, alongside cutting-edge music editorial content.

Napster's a la carte download and Napster To Go subscription services will continue to be available,