You almost certainly know this one: it’s Freddie Scott’s Are You Lonely For Me, Baby from the ’72 Academy of Music run; the Dead only played it once onstage, but listening to it again for the millionth time, I now believe that they only played it once, period. They simply don’t know how the song goes, but it’s close enough for rock and roll, and elegantly scruffed and nicked at the edges. Give it a whirl.