There are several bands/performers known as Gaia
1) An alias of Armin van Buuren - Official Site
2) A Peruvian Alternative Rock Band (*) - Official Site
3) A Korean Progressive/Avant-garde/Folk Metal band - See 가이아. http://www.gaia.co.kr/
4) An Italian singer/songwriter - Gaia Riva - Official Site
A collaboration between dutch trance producer Armin van Buuren and american singer-songwriter Jennifer Rene. Their lone track to date is "Fine Without You" on Armin's 2008 album Imagine. It is set to be the 4th single from the album.
Alexander Popov is one of the most quickly-developing Russian musicians. He makes both dance and instrumental music the main features of which are beauty and melodic. His early instrumental works were highly valued by professional musicians and composers and last tracks are repeatedly played by the best world-wide DJs: Tiesto, Paul Van Dyk and Armin Van Buuren.
Ørjan Nilsen, born the 14th of June 1982 in Kirkenes in Norway, started his interest in music at an early age. He started banging on drum sets at the age of 1 and was thoroughly instructed by his father and brother for the first 9 years of his life.