diminution

In music, diminution refers to the technique of dividing basic melody notes into shorter notes, effectively making the melody faster or more elaborate. This practice, also known as division, was a fundamental aspect of ornamentation in European music, particularly from the 14th century onwards.1

Diminution was often used at the end of musical sections (cadences) and became a notable feature in 18th-century concertos, especially in the cadenza. While composers sometimes provided a basic melody, performers were expected to improvise and fill it out with diminutions to enhance the music's expressiveness. This technique allowed for greater variety and virtuosity, though it could also lead to a "tasteless display" if not executed well. The principles of diminution influenced both vocal and instrumental music across different national styles, such as Italian and French, and its legacy can be seen in later musical developments.1