Like SellaBand, artists sign up, upload some of their music and then create proposals for new music they want to create. Fans can listen to and download the music (DRM free), and donate directly to proposals they like. The proposals are all different. One artist, for example, says he will mention the name of person who pledges the most in the song itself.
The service is more like SellaBand than Amie Street. SellaBand also lets artists upload music and takes donations. If donations get to $50k, as they have for several artists already, The artist gets a contract with a label. Amie Street, by contrast, simply lets artists sell their music on the site. Downloads starts at free and the price increases steadily as more downloads occur.
Strayform has had little press, but, inexplicably were covered by Fox News in a 3 minute segment. The video is available on their home page. I like the service, but the site sure could use a redesign.