"Stimulus for the auditory nerve"
On the back:
"Music is the healing force of the universe -- Albert Ayler"
It doesn't get any better than this, if you're looking for highly progressive fusion. Amazingly it hails from the relatively early years of 1972-1973 (i.e., music recorded in those years, I guess the record was released 2 years later). This band or album is completely different from the later US soul fusion band of the same name:
A representative piece is the "Morning Song," which has a fugue-like structure played between organ, flute, and electric guitar, with the drummer giving a wave-like sound with his cymbals in the background. Simply astonishing.