Here's the lesson(s) hopefully imparted: (1)how amazing is this guitarist? AND he's a street musician! AND this is free! (2)how incredibly lame is it that no one is hanging around? Watch all the people just walking by!
LESSON: When greatness presents itself, we need to be conscious enough to see it and perhaps love it. Don't let cool things pass us by as we walk through life in a tragic stupor. Be amazed.