Semi-excellent work from Weed - a P2P music sales network that rewards the artist, the network and the file sharers. The payment scheme is a slightly complicated pyramid affair, much like Kevin Marks' mediAgora, the tracks are overpriced (but that's up to the artist), it requires Windows and a Windows Media player, and it uses DRM (I have no idea why - seems to be just to make the payment scheme workable by tracing the passage of individual files) but it's a good start.
For what it's worth, I'd charge 10c per track and split the payment 2:2:1 between the artist, the uploader and the network.