Paul, I saw them only once, but it was memorable.
It was 1973 or thereabouts. I was 16 and had a front row seat to see Tower of Power and Santana at the Academy of Music on 14th Street (a 3,000-seat movie theater built in 1927). New Yorkers of a certain age will remember the Academy for its bathrooms, which - by comparison - would make visiting an opium den a wholesome experience.
It was the best concert I ever saw. At that time, ToP was still fronted by Lenny Williams, who is one of the most underrated soul singers of all time. Click on the link below to check out their (1973) live version of \"So Very Hard to Go\" on Soul Train.
Two great multi-ethnic Bay-area bands at their peak on one bill. 43 years ago, but the music is still as fresh as ever.
https://www.youtube.com/watch?v=APlwRR9IO_E