Phil Lesh, a founding member of the Grateful Dead whose nuanced bass playing made him an architect of the band's otherworldly sound, died on Friday at age 84, his Instagram account said. Tributes poured in from the music world and New York's Empire State Building said it would illuminate the skyscraper in tie-dye colors to honor a member of the psychedelic band known for lengthy improvisations in its live shows,

As tribute poured out from users online, Lesh’s surviving bandmates Bob Weir, Mickey Hart, Bill Kreutzmann, and even the family of late member Jerry Garcia penned heartfelt messages.

John Mayer is mourning the loss of the Grateful Dead’s Phil Lesh.