.According To My Files This was recorded in 1969 in Copenhagen. In the 70s Dollar Brand did a lot of solo piano concerts in Hamburg, mostly in a small crowded jazz club called "Uncle POU". I was just a teenager back then and I attended several of this shows, literally sitting under the piano and absorbing his strange playing style. I was, and still am, deeply impressed by his ability to play a strong ostinato figure with one hand and to go Completely crazy with the other one.
PS: There is an even better recording of this period, unfortunately only on vinyl: "Ancient Africa."