This KSAN radio broadcast marks a pivotal moment in the convoluted history of one of the West Coast's foremost bands, Jefferson Airplane. On this particular evening, Sunday 4th October 1970, San Francisco's Winterland Ballroom played host to the very cream of the city's psychedelic pioneers. But it was a supremely memorable event for two other reasons. Firstly, Janis Joplin had died the night before in Hollywood of a heroin overdose, and secondly, it marked the last appearance of Airplane founder and co-lead vocalist Marty Balin as a member of the band for almost 20 years.