Playing here in what would become a classic Grateful Dead venue in the heart of Grateful Dead country, the Dead began their somewhat conflicted relationship with Nassau Coliseum with a series of Bill Graham–produced Swell Dance Party shows in March 1973, just a week after Pigpen’s death. And in fact there probably are Heads dancing to this 20-minute set-closing “Playing In The Band” as it swerves into a bass stomp that sends the jam careening in a different direction. Performing in their Nudie suits for probably the last time, the Dead show off an assured collective voice as powerful as the classic compositions they debuted that year.