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In music, function (also referred to as harmonic function [1]) is a term used to denote the relationship of a chord [2] or a scale degree [3] to a tonal centre.Two main theories of tonal functions exist today:
"All harmonic idioms in popular music are tonal, and none is without function." [4] [vague] Tonality is an organized system of tones (e.g., the tones of a major or minor scale) in which one tone (the tonic) becomes the central point for the remaining tones. The other tones in a tonal piece are all defined in terms of their relationship to the ...
Monotonality is a theoretical concept, principally deriving from the theoretical writings of Arnold Schoenberg and Heinrich Schenker, that in any piece of tonal music only one tonic is ever present, modulations being only regions or prolongations within, or extensions of the basic tonality.
For the processing of chord functions four steps in processing can be described. (1)Primarily, a tonal centre has to be detected out of the first chords of a sequence. Often the first chord is interpreted as the tonal centre of a sequence and a reevaluation is necessary, if the first chord has another harmonic function.
In tonal music, chord progressions have the function of either establishing or otherwise contradicting a tonality, the technical name for what is commonly understood as the "key" of a song or piece. Chord progressions, such as the extremely common chord progression I-V-vi-IV, are usually expressed by Roman numerals in Classical music theory.
In a more specific sense, scale degrees are given names that indicate their particular function within the scale (see table below). This implies a functional scale, as is the case in tonal music. This example gives the names of the functions of the scale degrees in the seven-note diatonic scale.
In music, the tonic is the first scale degree of the diatonic scale (the first note of a scale) and the tonal center or final resolution tone [1] that is commonly used in the final cadence in tonal (musical key-based) classical music, popular music, and traditional music. In the movable do solfège system, the tonic note is sung as do.
In music, modulation is the change from one tonality (tonic, or tonal center) to another. This may or may not be accompanied by a change in key signature (a key change ). Modulations articulate or create the structure or form of many pieces, as well as add interest.