I definitely I prefer to sing in the car. I don't sing in the shower maybe its because that's the one time I don't need to talk to anyone so I should just shut up otherwise I'm just you know jibber jabber.
The role of the musician is to go from concept to full execution. Put another way it's to go from understanding the content of something to really learning how to communicate it and make sure it's well-received and lives in somebody else.