In 1952 Dick  Clark moved to Philadelphia, Pennsylvania where he  took a job
as a disc jockey at radio station WFIL (below) which had a affiliated TV station
with the same call letters (now WPVI). WFIL-TV  began broadcasting a show
called Bob Horn’s Bandstand in 1952. Clark was a regular substitute host on
the show and when Horn left, Dick Clark became the full-time host on July 9,
1956. The show was picked up by the ABC television network and renamed
American Bandstand and was aired nationally on August 5, 1957. On that
day, Clark interviewed Elvis Presley.  

Dick Clark at WFIL radio

1957