3-limit tuning and intervals

In music, unison is two or more musical parts that sound either the same pitch or pitches separated by intervals of one or more octaves, usually at the same time. Rhythmic unison is another term for homorhythm.

intonation system based on the chaining of perfect fifths

small interval in Pythagorean tuning between two enharmonically equivalent notes such as C and B♯

musical interval spanning five staff positions and seven semitones, whose frequency ratio is approximately 3:2=1.5 (in equal temperament, ¹²√2⁷=1.498…)

musical interval spanning four staff positions and five semitones, with a frequency ratio of approximately 4:3=1.333… (in equal temperament, ¹²√2⁵ = 1.335…)

thumb|Pythagorean ditone on C thumb|Pythagorean ditone as four just perfect fifths

gamut in ancient Chinese music