I dunno much about the japanese idol-singer culture, but I have already heard of the group AKB48.
It’s an all-girls idol pop group created in 2005 that has almost daily performances at Akihabara (the otaku center of the world) in Tokyo.

For this special American version of their latest single, River, director Jonathan Carrera produced this nice music video clip.
Lots more info about the group and video shootings on the source.

Source: AnimeNewsNetwork