Rock Band has announced a major new addition to their online track sales program. Later this year, the game will allow bands to upload their own music for the game. A given band or artist can submit their music to freelance developers or develop their own "track charts" in house. (Track charts are the split up set of notes that you need to match with your plastic instruments in the game.)

So far, Harmonix developers have made about 700 songs available to download and play on the game. Those titles have sold a combined 50 million downloads through the game. Sub Pop Records has already announced plans to submit songs from its upcoming fall releases as well as its bigger releases from the past two years.

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