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Leading-tone




Generally, the leading tone is the seventh tonal degree of the . In Music Theory , the leading tone triad is symbolized by the Roman Numeral vii°.

According to Ernst Kurth (1913) the Major and Minor Third s contain "latent" tendencies towards the Perfect Fourth and Whole-tone , respectively, and thus establish Tonality . However, Carl Dahlhaus (1990) shows that this drive is in fact created through or with harmonic function, a Root Progression in another voice by a whole-tone or fifth, or melodically ( Monophonically ) by the context of the Scale . For example, the leading tone of alternating C Chord and F Minor Chord s is either the note E leading to F, if F is Tonic , or A♭ leading to G, if C is tonic. In the 14th and 15th centuries, the leading-tone is created by the progression from imperfect to perfect Consonance s, such as a major third to a perfect fifth or minor third to a Unison . The same pitch outside of the imperfect consonance is not a leading tone.

As a Diatonic Function the leading-tone is the seventh scale degree of any Diatonic Scale when the distance between it and the Tonic is a single Semitone . In Diatonic Scale s where there is a Whole Tone between the seventh scale degree and the tonic, such as the Mixolydian Mode , the degree is the Subtonic .


SOURCES

  • Dahlhaus, Carl. Gjerdingen, Robert O. trans. (1990). ''Studies in the Origin of Harmonic Tonality'', p.184-5. Princeton University Press. ISBN 0-691-09135-8.

  • Kurth, Ernst (1913). ''Die Voraussetzungen der theoretischen Harmonik und der tonalen Darstellungssysteme'', p.119ff. Bern.