When music games were making Activision millions, the published tried to expand on Guitar Hero by making other spinoffs like DJ Hero and Band Hero. There was another "Hero" game in development, but Sing Hero, a karaoke game, was canceled when Activision decided to exit the music game business.
Pi Studios made Wii ports for the competing Rock Band series were hired to make Sing Hero.
Sing Hero measured the number of fans a player had as their score.
Recently, Activision filed another trademark for Sing Hero, but this version is scrapped since Pi Studios shut down.