, opening their 1970 release Master of Reality
. The song actually opens with a 99% feedback delay loop
of someone coughing up
a massive bonghit
The main guitar riff (A A D C# C C D, all E-form power chords) is found quoted by many other artists, including the end of the Red Hot Chili Peppers' "Give It Away", and it is "covered" by the Butthole Surfers in their magnum opus, "Sweat Loaf", off Locust Abortion Technician.