LOS ANGELES (AP) — The Mamas and the Papas, Al Kooper and Otis Redding — all performers at 1967’s Monterey International Pop Festival — were inducted into Hollywood’s RockWalk.The ceremony Friday marked the 40th anniversary of the celebrated Monterey rock festival, which was organised by music producer Lou Adler and John Phillips of the Mamas and the Papas.

Redding, who died in a plane crash in December 1967, was posthumously inducted. His widow, Zelma Redding, and daughter, Karla Redding-Andrews, received a plaque on his behalf.

A bronze bust of the R&B singer, who recorded the hit “(Sittin’ on) the Dock of the Bay,” will be installed at the sidewalk gallery outside the Guitar Center on Sunset Boulevard.

The Mamas and the Papas singer Michelle Phillips, the only living member of the ‘60s folk-rock group behind the hit “California Dreamin’,” put her hands in wet cement at the gallery.

“I’m a little overwhelmed that I’m really the only one here,” she said. “I know that I can speak for all of us when I thank all of you very much for being here.”

Kooper, the 63-year-old songwriter, pianist and record producer, also attended the ceremony. He co-founded the Blues Project and Blood, Sweat & Tears. He also played with Bob Dylan, including the signature organ riff on Dylan’s “Like A Rolling Stone.”

The RockWalk was established in 1985 to honour musicians who have made a significant contribution to the history of music.