Matrix."September First"1975 US Prog Fusion

On the front:
"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: