He won an Oscar for his work in "The Last Emperor."
His former bandmate Brad Fischetti shared the news in an Instagram post.
"His lyrics were one of a kind and helped to shape the music created by the band," Procol Harum said in a statement.
Leadon was a close friend of Tom Petty's, and played in two bands with the late rocker.
The hard rock band's co-founder passed after a spontaneous brain hemorrhage while on tour.
"We lost his frequency today," former P-Funk member Bootsy Collins wrote.
The Mexican singer and saxophonist was known for songs including "Juana La Cubana" and "El Colesterol."
“Death has tragically knocked at our door," his family wrote in a statement.
Largent's career brought him from KROQ to MTV's 120 Minutes before he became senior vp of A&R at Island Def Jam.
The spirited Israeli actor and singer portrayed the iconic character more than 3,500 times over more than four decades.
