**Pythagorean comma** — (PC) defined in Pythagorean tuning as difference between semitones (A1–m2), or interval between enharmonically equivalent notes (from D♭ to C♯). The di … Wikipedia

**Pythagorean tuning** — is a system of musical tuning in which the frequency relationships of all intervals are based on the ratio 3:2. Its name comes from medieval texts which attribute its discovery to Pythagoras, but its use has been documented as long ago as 3500… … Wikipedia

**Semitone** — This article is about the musical interval. For the printing method, see halftone. semitone Inverse major seventh (for minor second); diminished octave (for augmented unison); augmented octave (for diminished unison) Name Other names minor second … Wikipedia

**Pythagorean interval** — In musical tuning theory, a Pythagorean interval is a musical interval with frequency ratio equal to a power of two divided by a power of three, or vice versa. For instance, the perfect fifth with ratio 3/2 (equivalent to 31/21) and the perfect… … Wikipedia

**Septimal diatonic semitone** — Major diatonic semitone Inverse major seventh Name Other names Septimal diatonic semitone Abbreviation Size Semitones … Wikipedia

**Undevicimal diatonic semitone** — Minor diatonic semitone Inverse major seventh Name Other names Abbreviation Size Semitones 1 … Wikipedia

**Interval (music)** — For the album by See You Next Tuesday, see Intervals (album). Melodic and harmonic intervals. … Wikipedia

**Comma (music)** — Syntonic comma on C Play ( … Wikipedia

**Diminished second** — Inverse augmented seventh Name Other names Abbreviation d2[1] Size … Wikipedia

**Perfect fifth** — Play (help· … Wikipedia