There are three bands with the name Root.

Root is a Czech black metal legend from city of Brno founded in 1987 by Big Boss and Blackie. Root was one of the original pre-second-wave black metal bands, following in the footsteps of Bathory and Venom, while taking the genre in a more refined, less savage direction. Their style has since progressed towards a more epic, dark heavy metal sound with a clean-sung vocal approach, but their music can still be recognized as black metal at its core due to the unchanged ideology of the band. After the album Madness of the Graves (2003), Blackie left Root to concentrate on his band Cales. Blackie also plays in the band Entrails, a melodic black metal band.

Discography:


Reap of Hell Demo, 1988
War of Rats Demo, 1988
Death Metal Session II. Video/VHS, 1988
Messengers From Darkness Demo, 1989
The Trial Demo, 1989
7 Černých Jezdců / 666 Single, 1990
Zjevení / The Revelation Full-length, 1990
Hell Symphony Full-length, 1991
The Temple In the Underworld Full-length, 1992
Kärgeräs Full-length, 1996
The Book Full-length, 1999
Black Seal Full-length, 2001
Dema Best of/Compilation, 2003
Atomizer/Root Split Split, 2003
Madness of the Graves Full-length, 2003
The Devil's Diary Video/VHS, 2004
Live in Falkenberg Live album, 2005
Dema Box Set Boxed set, 2006
Casilda EP, 2006
Daemon Viam Invenient Full-length, 2007

More info is at their homepage.

Root is also the name of a polish grunge band to which you can find more info here: www.rootband.band.pl and an Australian country rock band