We have only first 7 alphabets (7 shuddh swar) in music which forms the music wheel.
For instance – A, B, C, D, E, F and G.
The musical alphabets start with C
For instance – C, D, E, F, G, A, B and C.
Memorize this diagram in both clockwise and anti-clockwise directions.
Let's take an example of a standard size keyboard
We can observe that –
The music wheel (7 white keys) repeats in clockwise direction from left to right.
Broadly, a set of 12 keys (7 white + 5 black) repeats at regular intervals on the keyboard.
Remember that the C note appears immediately on the left hand side of the 1st black key of the repeating set.
Next Read: Naming the Black Keys
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Explained very nicely ??