Having been obliged as a penance to sing it to the tune of Away in a Manger at the Wareham Wail last year (in order to get any food at the mediaeval banquet) the Sidmouth Anchor Middle Bar Singers sang the Wild Rover to many other tunes as well.
I'm grateful to Mr Happy, who, last year at MBS Lynne's Donisthorpe music weekend, got us singing Happiness to the tune of the Ellen Vannen, and vice versa.
And of course, no rendition of the White Cockade is complete without Pinball Wizard and My Old Man's a Dustman....