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.
Learning the Blues scale. The blue note in blues scale. Blues scale is the pentatonic scale with one more note (added in the scale). This note is known as âBlue noteâ and it is the flattened fifth in the case of the minor pentatonic, or the flattened third in the case of the major pentatonic.