1858 - First full-scale Operetta - Orpheus In The Underworld
1927 - First performance of Show Boat
1943 - Richard Rodgers writes Oklahoma! with Oscar Hammerstein II
1952 - Singin' In The Rain released
1957 - Stephen Sondheim makes his Broadway debut as lyricist for West Side Story
1968 - Hair, the first Rock Musical, opens
1986 - Phantom Of The Opera opens in London
1996 - Andrew Lloyd Webber's Cats becomes the longest running musical in the history of Broadway and London