U - Z
unison

Two or more instruments playing the same notes.

velocity

How quickly or hard a keyboard key is struck, which usually defines the volume of a note.

verse

The exposition part of a song where different words are sung to a repeating melody.

vibrato

Slight rapid up and down variation of the pitch of a note.

volume

A measurement of the loudness of a sound.

waveform

A graphical representation of a sound or audio signal.

whole note

Usually a note duration of one measure.

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