As far as famous songwriting duos go, John Lennon and Paul McCartney are arguably the most popular. If you go down the list, you'll probably stumble on Richard Rodgers and Oscar Hammerstein, who created some of the 20th century's best musicals, like The King and I and The Sound of Music. But before Rodgers collaborated with Hammerstein, he was part of another duo with a man history has largely forgotten - Lorenz "Larry" Hart.