Harmonix the creators the Guitar Hero and Rockband series has been sold by Viacom.
The series has been fading with the new Rockband and Guitar Hero not selling well at all. The newest Rockband brought the keyboard to the mix while the newest Guitar Hero just added some new game play mechanics. Its sad but I think this genre has hit its peak at the moment and won’t find much success unless they so something drastic in the next installment.
Anyways here is the statement from Viacom http://www.viacom.com/news/Pages/newstext.aspx?RID=1510571
Rip Rockband and Guitar hero