Gonna post another Zep here- Ironically one of the very best sounding "soundboards" from the 73 tour contains only the last 27 minutes of the show. The mixing boards they used back then had a cassette player and recorder built right into the board and most of the time they used 90 minute cassettes to record with that had 45 minutes per side of recording time. The cassettes were supposed to be kept an eye on but inevitably they would always be swiped. I guess this night in Denver only the last cassette was able to be swiped but nonetheless if you've never heard this, it's Zep on all 8 cylinders! List is here. Link. Note this is not an official release and is suitable for trading.
HEARTBREAKER