Skeleton KeyBy: David Shenk, Steve Silberman For fifty years and more than two thousand shows, the Grateful Dead have been earning the "deadication" of more than a million fans. Along the way, Deadheads have built an original and authentic American subculture, with vivid jargon and rich love, and its own legends, myths, and spirituality. Skeleton Key: A Dictionary for Deadheads is the first map of what Jerry Garcia calls "the Grateful Dead outback," as seen