The Rock Band Network has gone live on Xbox 360 with a catalog of 105 songs. With over 4,000 registered authors and peer reviewers registered to participate in the program, we're guessing a lot more tracks are coming. Prices range from 80 to 160 ($1 and $2).

Players will be able to download RBN samples if they wish to try tracks before they buy. Songs will debut exclusively on Xbox 360 for 30 days, after which "a selection of standout tracks" will become available on PS3 and Wii.