The idea that it is a C probably comes from the well-known fiddle tune "Staten Island" (aka "Staten Island Hornpipe"). The tune is is D with one passage moving into C in the middle of the B part. Some people feel that the C passage sounds like the Staten Island Ferry blowing its whistle. I have no idea if it was the intention of whoever wrote the tune or if it's a joke that's come to be taken seriously. For that matter, someone once told me that the tune was not named for Staten Island, New York at all, but for an island off the coast of Ireland. But he may have been lying.

I profess no sure-fire knowledge in the matter. I am but a sponge for other people's ignorance.

Bruce