Bob Weir, founding guitarist and vocalist of the iconic Grateful Dead, has died at age 78. His family announced his peaceful passing, stating he succumbed to underlying lung issues after courageously beating cancer. Weir, who joined the band at 17, was instrumental in shaping its psychedelic sound and continued to keep its music alive through various projects after co-founder Jerry Garcia's death. He is remembered as a guiding force whose artistry reshaped American music and built a lasting community for fans.