Beloved bassist Phil Lesh has died at 84 as fans mourn one of the founding members of The Grateful Dead. In the ’00s, bands like My Chemical Romance, Slipknot, and more developed incredibly devoted cult followings. Decades before, “Deadheads” helped set the template and remain one of the most passionate fandoms in all of music. The Grateful Dead formed in 1965 and fused genres to create a sound that thousands felt they couldn’t hear better anywhere else. Songs like Touch of Grey and Friend of the Devil enticed more and more people to check out their live shows, which became the stuff of legend…