Definitely a fertile time for progressive rock. The full lineup for the Oval concert was Wishbone Ash, Emerson Lake and Palmer, Genesis, Argent , Focus ,Jack Bruce, and Fudd. I've never heard of 'Fudd', but it is an insult in Scots!
Here is my quick edit of the Oval bootleg. A bit of Aquatarkus and some of Pictures at an Exhibition, just where the bass stands out. There is also a rare performance of 'Endless Enigma' on the bootleg that I could upload.