Quarter-comma meantone each kind, a perfect fifth of meantone contains four diatonic and three chromatic semitones, and an octave seven diatonic and five chromatic semitones, it follows that: Thus, in Pythagorean tuning, where sequences of just fifths (frequency ratio 3:2) and octaves are used to produce the other intervals, a whole tone is and a major third is An interval of a seventeenth, consisting of sixteen diatonic and twelve chromatic semitones, such as the interval from D to F, can be equivalently obtained using either This large interval of a seventeenth contains staff positions. In Pythagorean tuning, the size of a seventeenth
Octave glissando upward with the right hand. The "Alborada del gracioso" from Maurice Ravel's "Miroirs" contains glissandi in thirds and fourths in one hand. Octave glissando An octave glissando is a glissando played on the piano by maintaining a constant distance of an octave between the thumb and finger used to execute it, and shifting the whole hand in the direction of the glissando. Due to the positions of the thumbs on the player's hands, octave glissandos are almost always executed upwards with the left hand and downwards with the right. However, exceptions include Balakirev's "Islamey", where players are instructed to execute