Lou Adler is married to Daryl Hannah’s sister...if memory serves me correctly.
He also produced The Mamas & The Papas among many others.
John Phillips (mama's & Papa's) spent 20 minutes writing the song "If You're Going To San Francisco" (wear flowers in your hair) and gave it to his friend Scott McKenzie...the song sold over seven million records.
The Bee Gees song MASSACHUSETTS was a song about someone who was homesick after having gone to San Franciso during this period.