Doom

There are 2 bands with the name Catacombs: 1. Formed in 2000 by Xathagorra Mlandroth and released only one full album in 2006 - "In the Depths of R'lyeh". Catacombs comes from USA and plays very slow funeral doom metal. Xathagorra Mlandroth plays on all the instruments as well as vocals. Lyrical Themes: Lovecraftian, Dark, Esoteric and Conceptual Discography (from Encyclopaedia Metallum):
Echoes Through the Catacombs (EP, 2003)
In the Depths of R'lyeh (Full-length, 2006) 2. Catacombs is a melodic death metal band from Melbourne, Australia.

Hardcore/Crust band from Canberra, Australia. In 2009 they have released a demo and a 7 inch titled "3 Nails and a Book of Flaws" on Midnight Funeral Music. They are about to release their first CD LP: ‘I: A Turn for the Worse’ on Common Bond Records

There are several artists using the name "Earth". 1) The most well-known Earth is an american drone doom band formed in 1990 in Olympia, Washington, United States by Dylan Carlson, Slim Moon, and Greg Babior. They are pioneers in the minimalistic and repetitive form of doom metal known as drone doom or stoner drone. The band at some point moved to Seattle where Carlson forged a strong friendship with grunge music icon Kurt Cobain, who sang lead vocals for the song Divine and Bright on the live album Sunn Amps and Smashed Guitars.

Mournful Congregation is a band from Adelaide, Australia, founded in 1993, that plays very slow doom metal, with some funeral doom and death/doom influences.
The music revolves around melodies on electric and/or acoustic guitar and is further characterised by minimal drums, deep growled and whispered vocals. Main lyrical themes are personal spirituality, mysticism and depression/doom.
In 2009, the band performed live for the first time in their 15 year existence, with 4 Australian shows, and another 17 shows throughout Europe to promote their 2009 release The June Frost.