How does a composer choose the key for a composition?

[Rogerg]

This is something I have always wondered about and would like to get some opinions. I'm particularly refering to piano compositions where any key is possible.

[jossuk]

Quite a variety of possible responses to your question; try this YouTube link for starters. (I'm a pianist and composer.)

https://www.youtube.com/watch?v=ayhXCfO8skc