Question

Why there is black and white colour in piano not in blue, red, yellow, etc.?​

Answer 1

Answer:

Because Black and White are the best contrast colours and one could be mentally facilitated to play the notes properly.

Answer 2

Answer:

The most important reason behind the keys having black and white colour is that , if we had all the keys white in colour then it would be simply impossible for us to find our place in the keyboard. Everytime we would have to start from the bottom and count up all the keys to find a specific note.