Leaf Hound - Leaf Hound started life as Black Cat Bones, featuring members who left shortly after their first album to form Free & Foghat. The remaining members brought in vocalist Peter French and guitarist Mick Halls and then changed their name to Leaf Hound. The band would release just one album 'Growers of Mushrooms' in 1970 and to this day it remains a blistering slab of British heavy-rock with more than few proto-psychedelic/stoner rock undertones. I was first introduced to the band in 2001 via an Unida cover of the song Stray, but since then Leaf Hound have reformed, released a new album and are still touring today.
Unida - formed from the ashes of Kyuss & Slo Burn, Unida only had one released album (and another which the band themselves leaked on to the internet) and split up after a falling out with their label. A huge, huge shame as I personally rate Unida's work above anything John Garcia has done before or since, they're one of my all-time favourite stoner bands.
Carcass - despite having a fairly long run, UK death metal band Carcass only really hit their stride with their final two albums; Heartwork & Swansong, which, while not as heavy as previous releases, were both fantastic early examples of the melodic death metal genre.