From Docs // Creators.RockBand.com
In general, RBN songs should adhere to the same standards as the existing Rock Band Downloadable Content library, which is very close to "T" rated ESRB content. This gives authors a large body of precedent if they are unsure of a specific issues arising in an RBN song.
Specific examples may be viewed here: http://creators.rockband.com/forums/showthread.php?t=5384
only by registered members of the creators club.
