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In music
Music is the arrangement of sound to create some combination of Musical form, form, harmony, melody, rhythm, or otherwise Musical expression, expressive content. Music is generally agreed to be a cultural universal that is present in all hum ...
, a dyad (less commonly, diad) is a set
Set, The Set, SET or SETS may refer to:
Science, technology, and mathematics Mathematics
*Set (mathematics), a collection of elements
*Category of sets, the category whose objects and morphisms are sets and total functions, respectively
Electro ...
of two notes or pitches. The notes of a dyad can be played simultaneously or in succession. Notes played in succession form a melodic interval; notes played simultaneously form a harmonic
In physics, acoustics, and telecommunications, a harmonic is a sinusoidal wave with a frequency that is a positive integer multiple of the ''fundamental frequency'' of a periodic signal. The fundamental frequency is also called the ''1st har ...
interval.
Dyads can be classified by the interval between the notes. For example, the interval between C and E (four half steps) is a major third
In music theory, a third is a Interval (music), musical interval encompassing three staff positions (see Interval (music)#Number, Interval number for more details), and the major third () is a third spanning four Semitone, half steps or two ...
, which can imply a C major chord
In music theory, a major chord is a chord (music), chord that has a root (chord), root, a major third, and a perfect fifth. When a chord comprises only these three notes, it is called a major Triad (music), triad. For example, the major triad bui ...
, made up of the notes C, E and G.Young, Doug (2008). ''Mel Bay Presents Understanding DADGAD'', p.53. .
See also
* Double stop *Interval (music)
In music theory, an interval is a difference in pitch between two sounds. An interval may be described as horizontal, linear, or melodic if it refers to successively sounding tones, such as two adjacent pitches in a melody, and vertical or har ...
*Power chord
A power chord , also called a fifth chord, is a colloquial name for a chord on guitar, especially on electric guitar, that consists of the root note and the fifth, as well as possibly octaves of those notes. Power chords are commonly pla ...
*Harmonic series (music)
The harmonic series (also overtone series) is the sequence of harmonics, musical tones, or pure tones whose frequency is an integer multiple of a ''fundamental frequency''.
Definite pitch, Pitched musical instruments are often based on an Acoust ...
*Counterpoint
In music theory, counterpoint is the relationship of two or more simultaneous musical lines (also called voices) that are harmonically dependent on each other, yet independent in rhythm and melodic contour. The term originates from the Latin ...
References
Intervals (music) Simultaneities (music) {{Music-theory-stub