The varying color tones in ancient sound by paul klee were intended to be associated with

The varying color tones in ancient sound by Paul Klee were intended to be associated with music.
Given that Klee was a violinist, as well as a painter, the influence of music is quite obvious in his paintings as well. Even his paintings have names which are connected with music - one of them is called 'Ancient Sound.' 

Normally it is at the top left, above where the music starts.

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