Massacre, Meltdown sounds clearer and has more velocity and concussion than 90% of the discs in any collection. Frith, Laswell and Hayward do some of their best work on this one.
Harriet Tubman, Prototype, also sonically light years beyond most live rock recordings. Most gigs don't sound as good even when you're right in front of the mixing board.
Kraan live 74, Amazingly skilled and inventive jazz rockers refined and developed their great studio stuff by playing 200 plus live dates per year. Wolbrandt was like an early George Benson on mescaline and steroids. The electric sax, bass and percussion are also superlative.(not the best fidelity tho').
The Who, Live at Leeds, CRAPPY!! recording, but in this case, it doesn't matter. In terms of raw euphonious explosive power, no live record of this era that I've listened to comes close. You gotta look at Hendrix and then skip ahead to the Mahavishnu Orch. before even attempting to make a comparison.