Follicular and luteal phase lengths. â variability of menstrual cycle. attributable to follicular phase. â  Mean cycle length ranges from 27.3 to 30.1 days between ages 20 and 40 years, follicular. phase length is 13-15 days, and luteal phase length is less variable and averages. 13-14 days1-3.
Any sequence of seven successive natural notes, such as C-D-E-F-G-A-B, and any transposition thereof, is a diatonic scale. Piano keyboards are designed to play natural notes, and hence diatonic scales, with their white keys. A diatonic scale can be also described as two tetrachords separated by a whole tone.
The two primary pentatonic scales in common use are referred to as the major pentatonic scale and the minor pentatonic scale. Referring to the major diatonic scale as our reference point, the major pentatonic scale is composed of the 1st, 2nd, 3rd, 5th, and 6th degrees (or do-re-mi-sol-la as Doc put it). The minor pentatonic scale would be the 1st, flat-3rd, 4th, 5th, and flat-7th degrees. Views Â· View Upvotes.