Ludwig van Beethoven, Billet an Willibrord Mähler, Wien, ab 1819, Autograph

Beethoven apologizes to Willibrord Mähler for not yet having given him the promised "trifles" (according to the BGA possibly the Bagatelles op. 119 or op. 126, but then with a later date). He promises to visit Mähler as soon as possible.