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[[Image:Contrast chord example.png|thumb|Contrast chord example {{audio|Contrast chord example.mid|Play}}: C major and E minor contrast through their respective notes C and B (in red and orange), each a half step apart or leading tones. The chords share two notes (in blue) however.]]
The "'''counter parallel'''" or "'''contrast chord'''" is terminology used in German theory derived mainly from Hugo Riemann to refer to (US:) [[relative (music)|relative]] (German: parallel) [[diatonic function]]s and is abbreviated Tcp in major and tCp in minor (Tkp respectively tKp in Riemann's diction). The chord can be seen as the "tonic parallel reversed" and is in a major key the same chord as the dominant parallel (Dp) and in a minor key equal to the subdominant parallel (sP); yet, it has another function. According to Riemann the chord is derived through '''''Leittonwechselklänge''''' (German: "[[leading-tone]] contrast chords"), abbreviated Tl in major and tL in minor.
{{quote|The substitution of the leading tone for the prime (from below [<] in major, from above [>] in minor) likewise results...in the leading-tone change (in C major: T< <nowiki>=</nowiki> E minor, S< <nowiki>=</nowiki> A minor, D< <nowiki>=</nowiki> B minor[!]; in A minor: T> <nowiki>=</nowiki> F major, D> <nowiki>=</nowiki> C major, S> <nowiki>=</nowiki> B major [!].|Hugo Riemann|"Dissonance", ''Musik-Lexikon''<ref name="Oxford"/>}}
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