"Get Down" is a song by Gilbert O'Sullivan, from his album I'm a Writer, Not a Fighter. Released as a single, it spent two weeks at the top of the UK Singles Chart in April 1973, was also a number-one hit in Ireland and a top-ten hit in the United States and Canada. The song was originally used by O'Sullivan as a piano warm-up tune, but was eventually extended into a full song.
Believed to be an order from O'Sullivan to his dog ("Get Down!"), the singer is actually referring to a girl in the song behaving as a dog jumping on him, hence the request to "get down".