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A bagatelle is a short piece of music, typically for the piano, and usually of a light, mellow character. The name bagatelle literally means a "a short unpretentious instrumental composition" as a reference to the light style of a piece (Oxford English Dictionary 2001; Kennedy and Kennedy 2007). Although bagatelles are generally written for solo piano, they have also been written for piano four hands, harpsichord, harp, organ, classical guitar, vibraphone, unaccompanied oboe, clarinet, violin, viola, various chamber-music configurations, orchestra, band, voice and piano, and a capella choir.
Earliest known bagatelle 
Best-known bagatelles 
The best-known bagatelles are probably those by Ludwig van Beethoven, who published three sets, Opp. 33, 119 and 126, and wrote a number of similar works that were unpublished in his lifetime including the piece that is popularly known as Für Elise. Other notable examples are Franz Liszt's Bagatelle sans tonalité (an early exploration into atonality), a set for violin and piano (Op. 13) by François Schubert of which No. 9, The Bee, is often performed, the set by Antonín Dvořák for two violins, cello and harmonium (Op. 47), and sets by Bedřich Smetana, Alexander Tcherepnin and Jean Sibelius. Anton Diabelli also wrote a bagatelle in a short, happy form. Camille Saint-Saëns wrote Six Bagatelles, Op. 3, and Friedrich Baumfelder also wrote just one bagatelle, Op. 386, which was composed in his later years.
In the 20th century, several composers have written sets of bagatelles, including Béla Bartók, who wrote a set of fourteen (Op. 6); Anton Webern, who wrote a set of six for string quartet (Op. 9); and Gerald Finzi, who wrote Five Bagatelles for clarinet and piano. Another canonical modern bagatelle is the set by György Ligeti, who originally composed a set of eleven short works for piano entitled Musica Ricercata (1951–53), and later arranged a selection of them as Six Bagatelles for Wind Quintet (1953).
The Northern Irish composer Howard Ferguson wrote a set of Five Bagatelles for piano (Op. 9), which, along with his Piano Sonata in F minor, are among the composer's few regularly performed works. William Walton also wrote Five Bagatelles for the classical guitar for Julian Bream dedicated to composer Malcolm Arnold around 1970 (Walton 1974). These five pieces have been recorded by several eminent classical guitarists including Julian Bream, Sharon Isbin, Christopher Parkening, and Ana Vidović. The American composer Charles Wuorinen wrote a Bagatelle for solo piano, which he later orchestrated. The Australian composer Carl Vine also wrote Five Bagatelles for piano (1994), which are quite frequently performed at piano competitions, especially in Australia. Peruvian composer Jorge Villavicencio Grossmann also wrote Cinco Bagatelas Opacas y Traslucidas for violin and piano (also existing in a trio version with bass clarinet).
- Brown, Maurice J. E. 2001. "Bagatelle". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.
- Kennedy, Michael, and Joyce Kennedy. 2007. The Concise Oxford Dictionary of Music, fifth edition. Oxford and New York: Oxford University Press. ISBN 978-0-19-920383-3.
- Oxford English Dictionary. 2001. Third edition. Oxford and New York: Oxford University Press.
- Walton, William. 1974. Five Bagatelles for Guitar, edited by Julian Bream. Oxford and New York: Oxford University Press. ISBN 0-19-359407-2.