musical mode
Scales in traditional Western music generally consist of seven notes and repeat at the octave. Notes in the commonly used scales are separated by whole and half step intervals of tones and semitones. The harmonic minor scale includes a three-semitone step; the pentatonic includes two of these.
The diatonic scale (seven notes)
The melodic and harmonic minor scales (seven notes)
These scales are used in all of their transpositions. The music of this period introduces modulation, which involves systematic changes from one scale to another. Modulation occurs in relatively conventionalized ways. For example, major-mode pieces typically begin in a "tonic" diatonic scale and modulate to the "dominant" scale a fifth above.
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