How Large Is The Role Of Chance In The Final Product Of Your Compositions?

How does chance impact your compositions, and your compositional decisions? Does it impact their form? Their harmony? Their themes and development?

Or is every note in your compositions carefully thought out such that it is exactly as you intended it, and such that no other note might be substituted in its place to your satisfaction?

the second one

I think chance affects the composition indirectly by affecting the composer first.

There are instances where when I'm at the piano a finger might "miss" and strike the wrong key in a melody but it turns out to sound fine and then the melody goes in a different direction. That's about all I can think of when it comes to chance. If I'm not at the piano, then every note is fine tuned.

"Chance" is a major aspect of my music, during the process and as part of the final product.  Balancing looseness, freedom, and improvisation along with structure, progression, and control.

Chance looks out for me and I look out for chance. We have each others' back. She has said to me many times, don't you dare write out every note ahead of time without consulting with me first! What do you think I am, some kind of charlatan? I offer you the world, and you hunker down, obstinate, not producing anything. Then she flips her hair and i come back.