Just have to share this with you all. There is a cool Dutch guy called Reinier Sijpkens, who gives music performances on the canals of Ams, Utrecht, etc.
He plays various instruments backed up by an organ in the boat.
I guess some of you have seen him? He often plys 'duetto' with the organist in the clock tower of Oude Kerk.
Clip (from Utrecht):
http://www.youtube.com/watch?v=7YDUEDfhMeE