John Mayer and Bob Weir's first jam together

This month Dead and Company are playing two sold out shows at Red Rocks and two sold out shows at Fiddler's Green. John Mayer and Bob Weir first jammed together in February 2015 when Mayer was guest hosting "The Late Late Show." Mayer has said that hearing the Grateful Dead's song "Althea" was what led him to becoming a big fan of the band. (photo: Getty Images)


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