Which example describes the rhythmic elaboration of musical notes for expressiveness?

Diminution refers to the practice of taking a melodic line and elaborating upon it by breaking it down into shorter, faster notes while maintaining the original's contour and harmonic framework. This technique enhances expressiveness in music by adding embellishments and complexity, allowing the performer to convey a deeper emotional nuance. By incorporating more notes, the musician enriches the texture and can highlight specific moments within a piece, making it more engaging for the listener.

Articulation, while important for expressiveness, focuses on how individual notes are played or connected, such as staccato or legato. Rubato involves the flexible manipulation of tempo within a piece, giving performers the freedom to stretch certain sections for emotional effect, but it does not necessarily elaborate on the rhythmic structure of the notes themselves. Tempo shift refers to a deliberate change in the speed of the music, which can affect overall expressiveness but does not specifically relate to the rhythmic elaboration of notes.