Cadential Six-Four | A tonic six-four that delays the arrival of the root position V chord that follows it. Though the tonic six-four is technically a I chord, it is better to think of it as grouped with the V chord that follows it, as both chords have a dominant function in this context.
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Circle-of-Fifths Progression | A progression consisting of a series of roots related by descending 5ths and/or ascending 4ths. (Most of the 5ths and 4ths will be perfect, but if a diatonic circle-of-fifths sequence goes on long enough in root position, a o5 or +4 will appear.)
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Diatonic Sequence | A sequence that keeps the pattern within a single key.
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Imitation | The repetition of a pattern that occurs between two or more voices.
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Modified Sequence | A sequence wherein the repetitions of the pattern are neither tonal nor real.
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Passing Chord | A chord inserted between two more structurally important chords in a harmonic progression that serves to connect or prolong them, typically by means of a prominent melodic passing motion.
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Plagal Progression | The harmonic progression IV-I.
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Pre-Dominant | A term that can refer to a chord (typically ii or IV) or a harmonic function; precedes a dominant chord in a harmonic progression.
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Prolongation | The process by which the domain of a chord is expanded through the use of one or more subsidiary chords.
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Real Imitation | Similar to a real sequence, but with the transposed repetition of the pattern occurring in a different voice than the voice in which the pattern was initially introduced.
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Real Sequence | A sequence that transposes the pattern to a new key, which means that the modifiers of the intervals (major, minor, and so on) will not change when the pattern begins on a new pitch class.
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Sequence | A pattern that is repeated immediately in the same voice but that begins on a different pitch class.
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Tonal Sequence | A sequence that keeps the pattern in a single key, which means that modifiers of the intervals (major, minor, and so on) will probably change when the pattern begins on a new pitch class.
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Voice Exchange | Occurs in a harmonic progression when two voices, occupying different members of a chord, each prolong that chord by moving to the chord member the other voice had previously occupied (e.g.  (0.0K)— (0.0K)— (0.0K) and  (0.0K)— (0.0K)— (0.0K) in the bass and soprano voices respectively over the progression I-viio6-I6).
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