“Artists buy in bulk a set of cards that they can design with their own custom artwork and text. Each card has a unique redemption code and holds 15 credits. Participating artists then upload their music in MP3 format to their profile on the DiscRevolt site, which can also accommodate a bio, contact info and artwork. Bands can either sell or give away these cards to fans, who use the redemption code to download individual tracks — one credit per track.”