Recommended If You Like: A NovelBy Adam VoithLittle Engines Book The coolest eight people in the world were in Best Video the other night. What made them cool was they — and only they, nobody else — were listening to a series of old cassette recordings that might have been lost to time. Even when the recordings were new, few people heard about them. An Indianapolis teen named Andy Humphrey recorded the cassettes, then sent them to people who mad…