A vacuum tube that acts as an amplification component, also known simply as a tube. Since the silicon revolution, this component has been replaced in amplification circuits with the transistor.

The verse is the meat of a song. The function of the verse is to provide a context, provide background information, set the scene or tell a story, establish the vehicle by which the message of the song will be delivered, develop and evolve the story.

The verse gives listeners a deeper understanding of the main message of the song and it is the main method of giving a sense of progress through a song.

The first verse establishes the meter (lyrical rhythm), the rhyme scheme for further verses, and the type of language and phrasing to be used throughout the song.

Songs commonly have a number of verses, each composed of several lines. Rhyme may or may not be used within verses, but once established a rhyme scheme works best when it is adhered to.

As the song progresses, each verse further develops the story or theme.

Unit of measurement used to describe the magnitude of electro-motive force (EMF).

Voltage Controlled Amplifier (VCA)
VCAs’ are commonly used in audio equipment. Basically, they are amplifiers whose gain is governed by an input control voltage.

This term is used to describe the signal level of an audio signal or the intensity of the sound. Volume is usually expressed in decibels relative to a standard reference level or zero levels.

Volume Unit (VU)
A unit used for measuring the magnitude of a complex electrical signal.

VU Meter
A volume indicator.