![]() Origin of large and small seconds and thirds in harmonic series. ![]() The harmonic seventh is also expected from barbershop quartet singers when they tune dominant seventh chords ( harmonic seventh chord), and is considered an essential aspect of the barbershop style. Thus, in C major, "the seventh partial", or harmonic seventh, is notated as ♭ note with "7" written above the flat. Composer Ben Johnston uses a small "7" as an accidental to indicate a note is lowered 49 cents (1018 − 969 = 49), or an upside-down "7" to indicate a note is raised 49 cents. When played on the natural horn, as a compromise the note is often adjusted to 16:9 of the root (for C maj 7 ♭, the substituted note is B ♭ -, 996.09 cents), but some pieces call for the pure harmonic seventh, including Britten's Serenade for Tenor, Horn and Strings. Use of the seventh harmonic in the prologue to Britten's Serenade for Tenor, Horn and Strings The harmonic seventh arises from the harmonic series as the interval between the fourth harmonic (second octave of the fundamental) and the seventh harmonic in that octave, harmonics 4, 5, 6, and 7 constitute a purely consonant major chord with added seventh (root position). This is somewhat narrower than and is, "particularly sweet", "sweeter in quality" than an "ordinary" just minor seventh, which has an intonation ratio of 9:5 (about 1018 cents). The harmonic seventh interval, also known as the septimal minor seventh, or subminor seventh, is one with an exact 7:4 ratio (about 969 cents). Musical interval harmonic seventh Inverse
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