Bagatelle sans tonalité

Bagatelle sans tonalité ("Bagatelle without tonality", S.216a) is a piece for solo piano written by Franz Liszt in 1885. The manuscript bears the title "Fourth Mephisto Waltz" and may have been intended to replace the piece now known as the Fourth Mephisto Waltz when it appeared Liszt would not be able to finish it; the phrase Bagatelle ohne Tonart actually appears as a subtitle on the front page of the manuscript.

The Bagatelle is a waltz in a typical sectioned dance form, with repeated sections given inventive variation. While this piece is not especially dissonant, it is extremely chromatic, becoming what Liszt's contemporary François-Joseph Fétis called "omnitonic" in that it lacks any definite feeling for a tonal center. Some critics have suggested, however, that the various underpinnings of the piece—in other words, the main bass notes and melodic elements—work together to imply an underlying tonality of D, which would link the Bagatelle in terms of tonality with the Fourth Mephisto Waltz.