Question

the circle of semitones is used to illustrate relationships between: a. rhythms only b. notes c. chords only d. melodies only

Explanation:

The circle of semitones is a musical concept. It shows the relationships between notes. Rhythms (a) are about time - based patterns, chords (c) are combinations of notes, and melodies (d) are sequences of notes. But the circle of semitones specifically focuses on individual notes.

Answer:

B. Notes