I was reading the Rock Band Wikipedia page out of boredom and noticed this.
It has a citation for the February issue of Game Informer too. Seeing as it's Wikipedia, however, I just don't know.Recently, Harmonix has released songs over Xbox Live for paid download performed by Notorious B.I.G. made of vocal performance only. This sparked some controversy with the slain rapper's former wife, Faith Evans, who demanded the songs be taken down, citing the reason "He would never have wanted his music sullied this way. It is an insult to his memory." Since this, Evans's complaints followed by a lack of initiative to take down the downloadable content caused Evans to bring charges against Harmonix and is taking it to court. A court date has been scheduled for July 2012.