another one of my favorite bands. the track 'freedom' especially is good for when you're really in a 'stoner' groove. so check these guys out. this particular album is from 1972, they're kinda like an australian sabbath but may be a little heavier at times. definitely one of the grand fathers of what we'd think of as stoner rock today. and probably an influence on drone as well.
ps i was told by a good friend of mine that the album art to this, the one posted above, got them booted from their label.