That leads me to this incredible story. "Joshua Bell is one of the world's greatest violinists. His instrument of choice is a multimillion-dollar Stradivarius. If he played it for spare change, incognito, outside a bustling Metro stop in Washington, would anyone notice?"
What is this life if, full of care,
We have no time to stand and stare.
-- from "Leisure," by W.H. Davies
Thank to Lucy for pointing me to the story.