For example, in a woman with a 21-day cycle, the follicular phase is likely seven days; in a woman with a 35-day cycle, the follicular phase is likely twenty-one days. (Note: It is possible for a luteal phase defect to shorten the length of the menstrual cycle â this will be discussed in a future article on Phase II.
The diatonic scales. The diatonic scale is most familiar as the major scale or the natural minor scale (or aeolian mode). The diatonic scale is a very important scale. Out of all the possible seven note scales it has the highest number of consonant intervals, and the greatest number of major and minor triads.he diatonic scale is a very important scale. Out of all the possible seven note scales it has the highest number of consonant intervals, and the greatest number of major and minor triads.
While the scale degrees for the first six notes are the same for both major and minor scales, the seventh one is special. If the seventh note is a half step below the tonic, it is called a leading tone. If the seventh note is a half step below the tonic, it is called a leading note (or âleading toneâ). Play the C Major Scale, notice how the seventh note wants to lead into the tonic. Leading tones also occur in harmonic minor and melodic minor. In natural minor, the seventh note is a whole step below the tonic. In this case, the note is called a subtonic (or âflattened leading noteâ). Play the C Natural Minor scale, notice how the seventh tone lacks the desire to lead into the tonic.