"Oliver Cromwell" is a song recorded by Monty Python in 1980 but not released until 1989 where it featured on their compilation album Monty Python Sings. John Cleese, who wrote the lyric, debuted the song in the episode of the radio show I'm Sorry, I'll Read That Again broadcast on 2 February 1969, when it was introduced as "The Ballad of Oliver Cromwell". It is sung to Frédéric Chopin's Heroic Polonaise, and documents the career of British statesman Oliver Cromwell, from his service as Member of Parliament (MP) for Huntingdon to his installation as Lord Protector of the Commonwealth of England. The lead vocals, often heavily multi-tracked, are performed by Cleese, with interjections by Eric Idle.