There are several bands/performers known as Gaia
1) The Italian-Brazilian singer Gaia Gozzi, known as Gaia (born 29 September 1997) – Official Site
2) An alias of Netherlands artist Armin van Buuren – Official Site
3) An Alternative Rock Band (*) – Official Site
4) A Korean Progressive/Avant-garde/Folk Metal band – See 가이아. http://www.gaia.co.kr/
5) An Italian singer/songwriter – Gaia Riva – Official Site
6) A British band from South Yorkshire. Read more on Last.fm