As far as I know this has only been available as a VHS Tape and a Japanese Laser Disc... all now long Out Of Print.
I love this Film. It's a wonderful crazy cosmic romp loosely based in Anthropological Science, but not really... It is, however, filled with an otherworldly Musical Twist. It's Mystical, even Psychedelic, very tuneful, and definitely presented with tongue-firmly-planted-in-cheek.
A little Background: In 1985, Copeland released a solo album, The Rhythmatist. The record was the result of a pilgrimage to Africa and its peoples, featuring local drums and percussion; with more drums, percussion and other musical instruments added by Copeland.
The album was the official soundtrack to the movie of the same name, co-written by Stewart. He also starred in the movie, which claims that its "A musical odyssey through the heart of Africa in search of the roots of Rock & Roll."
The movie is an almost psychedelic, psychological, anthropological, and mythological cosmic adventure drawing from sources like Joseph Campbell and Carl Jung, and similar to Peter Weir's "The Last Wave." And we get to see Stewart playing drums in a cage with hungry lions surrounding him.