Leaf Hound
Growers of Mushroom (1971)
Leaf Hound is an English hard rock band that formed from blues rock band Black Cat Bones in 1970. Leaf Hound is often cited as pioneers of heavy metal, hard rock, psychedelic rock and stoner rock. Their 1971 debut album Growers of Mushrooms is said to be a mixture of heavy metal, hard rock, psychedelic rock and stoner rock, and influenced those genres.
http://www.leafhound.net/