 DJ Hero was announced by Activision in May 2009 . Prior to the announcement , the company had purchased FreeStyleGames , a small developer of music games , to help produce localized downloadable content for Guitar Hero games and a then @-@ <unk> music game , later revealed to be DJ Hero . DJ Hero uses a special <unk> @-@ based controller for players to perform with on various song mixes in the game . The game also incorporates the use of a Guitar Hero controller on ten specially arranged tracks ; Bright has suggested that future Guitar Hero games after Guitar Hero 5 may include the use of the <unk> control . 
