History? I have a question.

Has anybody ever heard anybody use 'am' in the way this song uses it? as in 'Skeeters am a-humming.'

I could believe 'skeeters be hummin'

or simply 'skeeters hummin'

or 'skeeters, they hummin'

But 'skeeters am a-hummin'? I don't think so.

Let's not forget that much of the appeal of this song lies in its wonderful, gently rocking melody.