Bob likes The Grateful Dead, at least the early stuff when Pigpen was alive. 'Speak on one's feet' refers to their reputation for improvisation and jamming, 'popular mechanics' could refer to the band as an incredibly popular yet incredibly technical group, and the bit about the 'sentimental torch' could just be about remembering to honour Pigpen.
There isn't any other sort of Pigpen other than the literal one, is there?
Bob likes The Grateful Dead, at least the early stuff when Pigpen was alive. 'Speak on one's feet' refers to their reputation for improvisation and jamming, 'popular mechanics' could refer to the band as an incredibly popular yet incredibly technical group, and the bit about the 'sentimental torch' could just be about remembering to honour Pigpen.
There isn't any other sort of Pigpen other than the literal one, is there?