The musical interval of a major second — also called a whole-tone — is the relationship between the first note (the root or tonic) and the second note in a major scale (and also a minor scale). It is the inversion of the minor seventh. It is abbreviated as M2.

It can be produced by starting on a high note and playing the second below or by starting on a low note and playing the second above.

A major second in just intonation most often corresponds to a pitch ratio of 9:8 or 1:1.125, or various other ratios, while in an equal tempered tuning, a major second is equal to two semitones, a whole-tone, a ratio of 1:2^2/12 (approximately 1.122), or 200 cents, 3.910 cents smaller. Two whole tones create a ditone, 9:8².

The major second is considered the most dissonant interval besides the minor second and major seventh.

See also

musical tuning, whole-tone scale, tonus.

Major second
# semitones	Interval class	# cents in equal temperament	Most common diatonic name	Comparable just interval	# cents in just interval	Just interval vs. equal-tempered interval
2	2	200	major second	9:8	204	4 cents larger

External links

• Tonalsoft Encyclopaedia of Tuning