According to The Royalty Network, Harmonix, the demi-gods behind the Rock Band games, have apparently licensed a bunch of decidedly un-Rock Band tracks. Here they are:

• “Ante Up” by M.O.P.(Grinnage/Murry/Pittman) administered on behalf of Blind Man’s Bluff Music (ASCAP)
• “Evacuate the Dancefloor” by Cascada (Eshuijs/Reuter/Peifer/Reuter) Sub-published on behalf of Talpa Music (ASCAP)
• “Say Aah” by Trey Songz(Ferebee/Neverson/Scales/Walker) Published on behalf of Skelatune Muzik (BMI)/ Tenyor Music (BMI)
• ”The Way I Are” by Timbaland feat D.O.E. (Hills/Hilson/Maultsby/Mosley/Bale’Wa/Mosley /Muhammad /Nelson) administered on behalf of Jerry Lee (ASCAP)

Three of those four tracks are poppy/R&B numbers, where M.O.P.'s "Ante Up" is a classic of hardcore gangsta rap. So what does it mean? No one but Harmonix knows for sure. It could be the weirdest Rock Band track pack ever released. It could be early indication of a new music game or the return of Harmonix Amplitude. I, however, choose to imagine Harmonix is working on a game where the members of M.O.P. take over the world by destroying Cascada, Trey Songz and Timbaland in gladiatorial combat.

Source: Bemanistyle