Denny Doherty, one-quarter of the 1960s folk-rock group the Mamas and the Papas, known for their soaring harmony on hits like "California Dreamin'" and "Monday, Monday," died at age 66.

The group burst on the national scene in 1966 with the top 10 smash "California Dreamin'." The Mamas and the Papas broke new ground by having women and men in one group at a time when most singing groups were unisex. John Phillips, the group's chief songwriter; his wife, Michelle; and another female vocalist, Cass Elliot, teamed with Doherty.

"Monday, Monday" hit No. 1 on the charts and won the band a Grammy for best contemporary group performance. Among the group's other songs were "I Saw Her Again Last Night," "Go Where You Wanna Go," "Dancing Bear," and versions of "I Call Your Name" and "Dedicated to the One I Love."

In 1998, the Mamas and the Papas were inducted into the Rock and Roll Hall of Fame.