Home Jambase Grateful Dead Play ‘Mind Left Body’ Jam On This Date At The...National Music NewsJambaseMusicGrateful Dead Play ‘Mind Left Body’ Jam On This Date At The Spectrum In ‘72 & ‘73September 21, 20161299FacebookTwitterPinterestWhatsApp Listen to the Grateful Dead jam on an often repeated theme on this date in Philly in 1972 and again in 1973.