1. It begins with a heartbeat. Released in 1973, The Dark Side of the Moon was Pink Floyd's eighth studio album. It would become one of the best-selling albums of all time, and its iconic cover image still hangs in college dormitories everywhere.

    The record turned 40 this week. To mark the occasion, Weekend Edition asked All Songs Considered hosts Robin Hilton and Bob Boilen where they were when they heard Dark Side for the first time.