Update: the server is back online but access to Rock Band specific files is not functioning (because they’re special files). For the time being, you can download ALL the TBRB files by downloading the following ZIP file. It has all 82 TBRB files so it’s pretty big. But at least you can get the songs this way while I figure out a way to get things working normally.
http://www.keepitfishy.com/tbrb/tbrb.zip
SEE BELOW
You are about to leave Rhythm Gaming World and access the external songs DB. While no song or file sold for commercially available videogames is hosted there and only fan generated content is allowed, Rhythm Gaming World has no direct control over the database and no files are hosted here. Alright, we had to made you aware of this, now you can visit the database!