Anton (or Antonio) Diabelli was an Austrian music publisher, editor and composer. Best known in his time as a publisher, he is most familiar today as the composer of the waltz on which Ludwig van Beethoven wrote his set of thirty-three Diabelli Variations. Diabelli was born in Mattsee near Salzburg. A musical child, he sang in the boys' choir at the Salzburg Cathedral where he is believed to have taken music lessons with Michael Haydn. By age 19, Diabelli had already composed several important compositions, including six masses.