SpiralFrog has launched a free, ad-supported music download Website in North America. Users can download unlimited song files and related content for free, just for watching targeted advertising.

"Music fans demand fast access to high quality audio and video files and they want their music free, but they'd still like the music owners to be paid for their work and creativity," Joe Mohen, chairman and founder of SpiralFrog, said in a statement. "Our answer to this seemingly impossible equation is to allow our audience to download songs and video at no cost-other than their time and attention-and to compensate music owners by sharing the ad revenue."

The SpiralFrog site will allow anyone to access and download files from a library of more than 800,000 songs and 3,500 music videos, with new content being added every day. SprialFrog also promises it will integrate the advertising in a "compelling" way. "The more we can make the advertising relevant to users' tastes and demands through tailor-made programs and micro-targeting, the more potential we create for a meaningful experience," George Hayes, SpiralFrog's senior vice president of marketing and sales, said in a statement.

Songs and videos downloaded on SpiralFrog will play on Windows PCs running XP and Vista. Members can download songs to their PCs and synchronize their music with up to two portable music players or music-enabled phones that support Windows Media DRM.