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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, literally: "[[leading-tone]] changing sounds"), sometimes called ''gegenklang'' or "contrast chord", abbreviated Tl in major and tL in minor <ref name="Gjerdingen"/>, or, in German literature, abbreviated Tg in major and tG in minor (standing for "Gegenklang" or "Gegenparallel"){{citation needed|date=February 2020}}. If chords may be formed by raising (major) or lowering (minor) the fifth a whole step ["parallel" or relative chords], they may also be formed by lowering (major) or raising (minor) the root a [[half-step]] to ''wechsel'', the [[leading tone]] or ''leitton''.
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