Pythagorean tuning guitar

Musical parts sounding at the same pitch

For other uses, see Unison (disambiguation).

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.^[1]

Definition

Musical interval

Two pitches that are the same or two that move as one.^[2]

Unison or perfect unison (also called a prime, or perfect prime)^[3] may refer to the (pseudo-) interval formed by a tone and its duplication (in German, Unisono, Einklang, or Prime), for example C–C, as differentiated from the second, C–D, etc.

In the unison the two pitches have the ratio of or 0 half steps and zero cents. Although two tones in unison are considered to be the same pitch, they are still perceivable as coming from separate sources, whether played on instruments of a different type: play unison on C, piano and guitar^ⓘ