Final answer:
Unstable combination refers to a dissonant set of notes with tension, typically caused by beats in nearby frequencies. Agreeable combination is a set of notes that produce a harmonious, pleasant sound. Sustained pitch is a consistent, unchanging tone held over time.
Step-by-step explanation:
Matching terminology to their correct descriptions of harmony involves understanding how different combinations of musical notes interact with each other. The terms provided are:
- Unstable combination
- Sustained Pitch
- Agreeable combination
An unstable combination is a set of notes that, when played together, create a sense of tension or dissonance. This is often due to the beats that occur when two musical notes or frequencies are played together that are close in pitch but not identical, causing a warbling or unpleasant sound. An agreeable combination, on the other hand, refers to harmonious and consonant sounds that are pleasant to the ear. Lastly, a sustained pitch is a single tone that is held constant over a period of time without fluctuation in pitch or loudness.