How do you find something deep to make art about

You could do a lot of research into why past artists made their art, or you can look at the different eras of time and why that art was made (Like the Romantic era was full of art that showed others how to care for each other) or you can even look into your own life or self, and see what part of it you can use to make art to represent that, making it deep to you, if not others.

Hope this all makes sense and helps!

Explanation:

a chromatic scale uses the twelve tones of the octave, while a regular scale only uses eight, or seven different notes (as the first note is played twice)