Jill Gibson time when the leader of the group, John Phillips, fired his wife, Michelle Gilliam Phillips, from the band on Saturday, June 4, 1966, for having had an affair with Gene Clark of The Byrds. Instead of the group breaking up, they asked Jill Gibson to join The Mamas & the Papas as their newest member "Mama Jill". Shortly after joining the band, The Mamas & the Papas, along with Lou Adler, left for Europe for several weeks to begin working together. Arriving in London, England, Gibson, Cass Elliot, John Phillips, Denny Doherty, and Lou Adler rented the top half of
The Mamas & the Papas February 1966 and became its only number-one on the "Billboard" 200. The third and final single from the album, "Monday, Monday", was released in March 1966. It became the band's only number-one hit in the US, reached number three in the UK, and was the first number-one on Spain's new Los 40 Principales. "Monday, Monday" won the Grammy Award for Best Pop Performance by a Duo or Group with Vocals in 1967. It was also nominated for Best Performance by a Vocal Group, Best Contemporary Song, and Record of the Year. Their second album, "The Mamas & the Papas", is