As the surviving members of the Grateful Dead reunite for concerts in New York this weekend, Soundcheck’s occasional series on superfans continues with a look at Deadheads. Music critic Ben Ratliff of the New York Times; Peter Conners, author of the memoir "Growing Up Dead;" and sociologist Rebecca Adams of the University of North Carolina-Greensboro join us for a look at how these loyal disciples have maintained a vast subculture (and nearly 2,200 concert recordings).