April 24th 1969 marked Led Zeppelin's return and first date back in San Francisco following the heady days in January of the same year. In four months, the band was now incorporating the new material in the set that would appear on 'Led Zeppelin II', being currently recorded in Los Angeles - for example, 'The Lemon Song/Killing Floor'.
The idea of recording and capturing the fluent energy while being on the road was definitely working - especially after concerts like these.
