I'm getting bored by the attacks on our original poster, but I do like the Early Music version of Pachelbels' Canon posted by Jack Campin. Not the best argument against accompaniment though, is it?

I haven't been arguing against accompaniment in general. The theme in the Pachelbel Canon is not an Irish traditional tune and was only ever intended by its composer to be used in a contrapuntal composition.

There are also lots of folk traditions where polyphony is ubiquitous and solo melody unknown. ITM isn't one of them.