Major second
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In Western music theory, a major second is a second spanning two semitones. A second is a musical interval encompassing two adjacent staff positions. For example, the interval from C to D is a major s
Diagram showing relations between epogdoon, diatessaron, diapente, and diapason
Diatonic scale
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In music theory, a diatonic scale is a heptatonic scale that includes five whole steps and two half steps in each octave, in which the two half steps are separated from each other by either two or thr
The modern piano keyboard is based on the interval patterns of the diatonic scale. Any sequence of seven successive white keys plays a diatonic scale.