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 corresponds to a pitch ratio of 9:8 or 1:1.125 while in an equal tempered tuning, a major second is equal to two semitones, a whole-tone, a ratio of 1:22/12 (approximately 1.122), or 200 cents, 3.910 cents smaller. Two whole tones create a ditone, 9:82.
In music, a whole tone scale is a scale in which each note is separated from its neighbors by the interval of a wholestep.
The whole tone scale is interval cycle 2, or C2.
Since there are only two transpositions of the whole tone scale it is either C2 or C2 The whole tone scale is also maximally even and may be considered a generated collection.
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