Bob Weir, the guitarist who co-founded the Grateful Dead, has died aged 78.


Weir, a cornerstone of the California psychedelic rock group and many of its offshoots, passed away after a battle with cancer and lung issues, according to a post on his Instagram.


There is no final curtain here, not really. Only the sense of someone setting off again, the post says, noting his hopes that his legacy and lengthy catalogue will live on.


The post says he transitioned peacefully, surrounded by loved ones.


He often spoke of a three-hundred-year legacy, determined to ensure the songbook would endure long after him, the post continues. May that dream live on through future generations of Dead Heads. Weir's career spanned more than 60 years, founding the Grateful Dead in 1965, which rapidly became a major influence in San Francisco's counterculture.


They are known for blending psychedelia with folk and Americana, creating a unique sound that helped pioneer the jam band genre. The band was inducted into the Rock and Roll Hall of Fame in 1994 and received a Lifetime Achievement Award from the Grammys in 2007.


The group officially halted in 1995 with the death of fellow co-founder Jerry Garcia. However, Weir remained active in music, performing with various spin-offs, including Dead & Company.


Weir was diagnosed with cancer in July but continued to perform even during treatment, with his family emphasizing the emotional power of his performances. Their heartfelt message described these episodes not as goodbyes but as gifts.


Following his passing, tributes filled social media, with fellow musicians and fans honoring his memory. The Empire State Building even lit up in tie-dye colors to commemorate the rock legend.


Among the tributes was guitarist Slash of Guns N' Roses, who shared an image of Weir on stage with a heartfelt note. Former Eagles guitarist Don Felder reflected on their connection and the impact of Weir’s music.


Weir’s former publicist highlighted his unique sense of humor and his dedication to music, stating that he lived for the road and for creating music until the very end.