Instagram/John Mayer & Bob Weir Music John Mayer launches a weekly Grateful Dead SiriusXM listening party to unite fans in music and memory after Bob Weir's passing. March 9, 2026 AceShowbiz - In response to the recent death of Bob Weir, co-founder and guitarist of the legendary Grateful Dead, his fellow bandmate John MayerJohn Mayer has initiated a new way for fans to connect with the band's music and legacy. Mayer, who has performed with Dead & Company since 2015, is launching a weekly Grateful Dead Listening Party on his SiriusXM radio channel.