open mike, that was exactly the scene (from "O Brother") that occurred to me; hence the song suggestion. And I muffed the title--"Down to the River to Pray". Plenty of threads here about it.

The other watery songs that occur to me are naval, pastoral, amorous or of treachery. The Robin Hood scene reminds me of lumberjacks birling. But I've never heard a song about a birling contest; the closest has been about a log-pulling contest ("Little Brown Bulls").