LOS ANGELES (AP) Phil Lesh, a classically trained violinist and jazz trumpeter who found his true calling reinventing the role of rock bass guitar as a founding member of the Grateful Dead, died Friday at age 84.

Leshs death was announced on his Instagram account. Lesh was the oldest and one of the longest surviving members of the band that came to define the acid rock sound emanating from San Francisco in the 1960s.

Phil Lesh, bassist and founding member of The Grateful Dead, passed peacefully this morning. He was surrounded by his family and full of love. Phil brought immense joy to everyone around him and leaves behind a legacy of music and love, the Instagram statement reads in part.