This day in music history.

July 9, 1956, Dick Clark replaced Bob Horn as host of "Bandstand" on Philadelphia TV station WFIL. The name of the show was changed to "American Bandstand" when it went to ABC-TV the following year. American Bandstand was the first network television series devoted to rock and roll and the longest running musical show in television history. Chuck Berry, Jerry Lee Lewis, Buddy Holly, and Chubby Checker all made their debut on American Bandstand. Clark retired from the show in 1989 and was replaced with David Hirsch.