SLENDRO
The pentatonic scale uses 5 tones in an octave.
A scale of eight tones based on "Do" is known as an octave scale, which includes the notes: Do, Re, Mi, Fa, Sol, La, Ti, and Do (the higher octave). In Western music, this is commonly referred to as the major scale, where each note corresponds to a specific interval from the root note, "Do." This scale forms the basis for melodies and harmonies in various musical compositions. The first and last "Do" represent the same pitch, completing the octave.
Let's do C major. C D E F G A B. So there are 7. If you count the octave (C), then 8. This is the same with any major scale.
Parallel lines are equidistant from one another
I would say between the 7th and the octave. Play a major scale but stop on the 7th............and wait. Doesn't it feel like it needs to be resolved?
There are 100 cents in a semitone, so there are 1200 cents in an octave. Since an octave is equal to doubling the frequency, there are 2 tones (whole steps) in an octave.
octave
12 Tones in an Octave
8
12 semi-tones in an octave
an octave
An octave.... 0.0
I am not assuming I am in the key of F (one flat), there is one semi-tone in each octave: B flat. While Iam navigating the entire 2 1/2 octave range, navigating the range chromatically, then each note change is a semi-tone, 13 semi-tones in all for each octave. So 13+13+6 = 32 semi-tones in 2½ octaves.
The pentatonic scale uses 5 tones in an octave.
A note that is one octave higher is double the frequency. In Western music this frequency range is divided into twelve tones. The difference between each tone is called a half-step. A musical scale uses a series of eight tones, combining whole steps and half-steps, to reach the doubled frequency. It's mostly a matter of how music is defined and what our ears are accustomed to hear. In Eastern music systems there are more tones defined between a note and double its frequency. Because Western music defines a scale to have eight tones, the range is called an octave.
A B G next octave G D
The "whole tones" in music are most easily defined in the key of "C", due to the piano being the most commonly played musical instrument. On a piano, all of the "white" keys are whole tones, some separated by semi-tones, as shown by the "black" keys. In an octave, one will find seven "whole" tones, with eight in total due to a repetition of the starting tone at the end. There are five "semi-tones" (black keys) in between in each octave, after the first, second, fourth, fifth and sixth whole tones. "middle" C on a piano is ~260hz, while the ending tone on the octave is double this, at ~520hz, and each "whole" note interval in between progressively and incrementally is staged in between.