1) BGM is a Vanity Records-artist from Japan from the 70s. 2) "BGM" is also short for background-music therefore it can be music from just about anywhere e.g. movies, anime, games or tv-series. 3) bgm lives in Toronto and makes homemade songs. 4) For the Korean artist BGM (Beauty Gorgeous Music), see 비지엠

Read more about BGM on Last.fm.