During the harshest days of Soviet censorship, it was nearly impossible and highly risky to get your hands on Western music. But Soviet people became experts at finding creative, sometimes extraordinary, ways to reprint and share forbidden sounds — using material like old X-ray tapes. Stephen Coates is a London-based audiophile and author of the book, “Bone Music: The History of the X-Ray Underground.” He tells Host Marco Werman about the long lost art of making “ribs.”