Parliament-Funkadelic in 1976.
The incomparable Glen Goins on the lead vocals. Goins died in 1978 of Hodgkins Disease, shortly after leaving P-Funk because of poor treatment from George Clinton. He was purportedly given six months to live before even joining the Funk Mob, then lived a further two and a half years.
Edited to add this bonus footage of Glen calling down the Mothership: