"It was the great second movement of K533"
Detail of an unfinished portrait of Mozart
Public DomainDetail of an unfinished portrait of Mozart - Credit: Joseph Lange

The musical compositions of Wolfgang Amadeus Mozart (1756-1791) are often identified by a 'K' number. This refers to their position in the Köchel-Verzeichnis ('Köchel Catalogue'), a chronological list of Mozart's compositions put together by Ludwig von Köchel and first published in 1862.

K533, which was completed in 1788, is Mozart's Piano Sonata No. 15 in F major. Listen here to the second movement on Spotify.