If you feel you have the right key, you try to make some phrase or sound that will fit.
“I can't tell you where a poem comes from, what it is, or what it is for: nor can any other man. The reason I can't tell you is that the purpose of a poem is to go past telling, to be recognised by burning.”
“I think any parent that makes their kid sit at a piano against their will and practice, they're going to have a kid that's not going to want to play the piano.”