I was delighted to come across this wonderful recording through Led Zeppelin Boots' amazing YouTube channel. April 14, 1970 had Led Zeppelin playing Ottawa, Alberta in a brilliant, exciting, explosive kaboom of awesomeness.
The tape itself in fragmentary and incomplete, but what's here is gold. I play Dazed and Confused, Heartbreaker, and an incredible White Summer/Black Mountainside. This show was a delight!