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.
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.