The Leading-tone reference article from the English Wikipedia on 24-Apr-2004
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Leading-tone

In music theory, the leading-tone (called the leading-note outside the US) is the seventh scale degree of any diatonic scale when the distance between it and the tonic is a single semitone. In diatonic scales where there is a whole tone between the seventh scale degree and the tonic, such as the Mixolydian mode, the note is called the sub-tonic.

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