The correct option is D. When discussing how loud or quiet a composition is you are referring to Pitches.
In music, pitch refers to a sound's location within the entire sound spectrum. Depending on the frequency at which the sound waves that produce them vibrate, sounds have a higher or lower pitch.
There are two different types of pitch: definite pitch, which is produced by periodic sound wave oscillations, and indefinite pitch, which is produced by erratic sound wave oscillations. Tones are defined pitches that are quantified by their frequency, which is a mathematical computation of the number of cycles per second.
A person with perfect pitch is able to name each musical note they hear after hearing it, without using any other notes as a reference. The ability of some singers to sing a specific note precisely on cue is referred to as perfect pitch, which is more formally known as absolute pitch.
Thus, Pitch plays a crucial role in music because it allows us to determine whether a sound is higher or lower in the sense connected with melodic music.
Learn more about Pitches here:
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