The Cake performing on the Smothers Brothers Variety Show back in 1967. Jeanette Jacobs, the stunning brunette in the green pantsuit, is clearly not a happy camper. Her involvement with Jimi Hendrix and penchant for dropping buckets of acid might explain her demeanor.
Upon further review, the real backstory can be found at Dangerous Minds along with a fascinating look at the "Real Life Valley of The Dolls". Check it out.
Thanks to The Redundant Variety Hour for starting me on the journey.