As a showcase for Rock Band Network authors to share their music with potential fans, the Rock Band Network eventually grew to include 2,121 downloadable songs. When you include the Rock Band Network alongside the series' official DLC tunes, the total Rock Band series tracklist comes to a staggering 4,221 songs.
Despite its impressive utility, in the end the Rock Band Network was laid low by mounting technical problems. "Some of those problems were server side here at Harmonix, while others were entirely outside of our control," reads the developer's official announcement. "At this point, with Harmonix resources devoted to several other titles in development, we're no longer able to operate RBN with the kind of consistency that it deserves."
Edit: This article initially stated that the Rock Band Network allowed users to upload their own tracks. It has since been altered.