I found these guys a couple of years ago. Great tone. Great distortion. Great vocals. Powerful. I liked them so much, that while it was possible to just download their music, I made a point of purchasing their work. Love the album art. Love the songs. Everytime I hear the vocals I'm amazed.

Bandcamp: http://supertzarstoned.bandcamp.com/

So, I happened upon this by accident. I had to both share, and save the link for my own enjoyment

Magic occured tonight. There was a confluence of results such that youTube offered up a fantastic listing of circa-1970 proto-metal.

Lyrics to Black Sabbath's, "Over To You" from the "Never Say Die!" album, 1978.