Conversation so far:
What happened in 1965 for Michelle Phillips?
Phillips was a founding member of the Mamas & the Papas, helping to form the vocal group in 1965.
Who was in the vocal group The Mamas & the Papas with Michelle Phillips?
The Mamas and the Papas was formed by husband and wife John and Michelle Phillips, formerly of the New Journeymen, and Denny Doherty, formerly of the Mugwumps.
What was the vocal group The Mamas & the Papas first project together?
If You Can Believe Your Eyes and Ears
What was The Mamas & the Papas' If You Can Believe Your Eyes and Ears about?
debut album
How was The Mamas & the Papas' debut album If You Can Believe Your Eyes and Ears received?
The album received a positive retrospective review in Rolling Stone

Question: Why did they do that?
Self-contained rewrite: Why did the Rolling Stone give the album  If You Can Believe Your Eyes and Ears by The Mamas & the Papas a positive restrospective review?