Some information on JAM Project, copied from their
Wikipedia page.
QUOTE (JAM Project Wiki Page)
JAM Project ("JAM" standing for "Japan Animationsong Makers") is an anime music genre (or anison) "supergroup" based in Japan, originally founded on July 19, 2000 by famous 1970s theme song artist Ichirou Mizuki. The group is composed of many vocal artists well known in the genre; aside from the many anime and video game theme songs that this group has performed together, each member is famous for his or her own solo performances of anime-related music.
As a group, they are perhaps best known for their themes for the Super Robot Wars series of video games.
The group has recently moved into the realm of live-action theme songs by performing opening and insert themes for the recent tokusatsu show GARO.
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In 2008, JAM Project went on their first world tour. While some of the members have performed internationally, this was the first time JAM Project toured internationally as a group.
Some of the stops on their World Tour included:
Paris, France (Chibi Japan Expo)
Maryland, USA (Otakon)
Mexico City (Expo Manga Comic TNT16)
Barcelona, Spain (XIV SALON DEL MANGA)
Along with some other places.

The group has Regular members, Part-Time members, and a few Graduated members. Their Discography consists of 36 Singles (including their collaboration with NICE GIRL μ), and 6 Albums.
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All in all.. I think NICE GIRL μ was pretty lucky to get the chance to do something with this group, esspecially for anime, since that's where they're most known.