Bob Weir, the singer, songwriter and founding member of the Grateful Dead, has died at 78.

“Bobby Weir, just 17 years old when he co-founded the Warlocks, was one of the very few people who was at every single Grateful Dead show.

Along with his late fellow Grateful Dead co-founder and lead guitarist Jerry Garcia, who was at the center of the Deadhead universe, Weir was one of the group’s two frontmen and main vocalists for mos...