Conversation so far:
What happened in 1965?
There, Phillips was a founding member of the Mamas & the Papas, helping to form the vocal group in 1965.
Who was in it?
Cass, John, Michelle, Dennie.
What was their first project together?
Doherty and John Phillips had reconciled and ostensibly written I Saw Her Again (1966) about the episode.

Question: What was that about?
Self-contained rewrite: What was I Saw Her Again about?