This... is the sound of his agitation

"If you hear a marching band, is your soul exalted? No, you march. If you hear a waltz, you dance. If you hear a mass, you take communion.

It is the power of music to carry one directly into the mental state of the composer. The listener has no choice. It is like hypnotism.

So, now... What was in my mind when I wrote this? Hmm? A man is trying to reach his lover. His carriage has broken down in the rain. The wheels stuck in the mud. She will only wait so long.

This... is the sound of his agitation.

"This is how it is... ," the music is saying. "Not how you are used to being. Not how you are used to thinking. But like this."

(Beethoven on music in Immortal Beloved)