The Mamas and the Papas made their inaugural recording singing backing vocals on McGuire 's album This Precious Time .
Mamas and the Papas had already released a single of Mamas and the Papas ' own by the time the album appeared in December 1965 .
The Mamas and the Papas made their inaugural recording singing backing vocals on McGuire 's album This Precious Time , although they had already released a single of their own by the time the album appeared in December 1965 .