What is the definition of diminution in musical context?

Diminution in a musical context refers specifically to the practice of taking a given melody or theme and embellishing it by breaking it down into shorter, faster note values. This technique often involves creating variations of the original melodic line, giving the performer the opportunity to showcase their virtuosity and interpretative skills.

By using shorter notes, musicians can add complexity and interest to a musical piece without altering the fundamental structure or harmonic integrity of the theme itself. This method has historical significance, especially in Baroque music, where it was a common technique for improvisation and ornamentation.

The other options do not accurately define diminution: speeding up the tempo relates to the overall pace of a piece rather than the subdivision of notes; changing the key of a melody involves transposition, which is a different concept; and playing music at a softer dynamic refers to volume rather than the note length or embellishments. Therefore, the correct choice clearly aligns with the established definition of diminution in music.