He was born in Head of the Harbor, New York and moved to New York City in 1798, where he worked in several jobs, including carriage-maker, before opening a grocery and inn. He played flute, piano, and violin.
His blackface song "Backside Albany", ridiculing the British during the War of 1812 was to be sung "in the character of a Negro sailor", ridiculing the British efforts. It was first performed in Albany, New York, February 15, 1815, as part of a play, The Battle of Plattsburgh.
- The Riches of Sight: William Sidney Mount and His World
- The Battle of Plattsburgh: Songs and Tunes of 1814
- Our Heritage: The World of William S. Mount (Word doc), from the Long Island Museum.
- Peter Goodman, A Real Yankee First, from New York Newsday's Long Island history site.