Thirty years ago, Pink Floyd's recording The Dark Side of the Moon became the number one album on Billboard magazine's pop music chart. So began the longest streak in music chart history: 741 weeks on the Top 200. No other recording comes close. The album has touched one generation after the next, which is odd because it's such a quirky album of electronic music, sound effects, saxophones, and a famous but unidentified female singer performing scat. Reporter Jad Abumrad of member station WNYC went around New York City to ask likely listeners why Dark Side has lasted.