Whitney Houston and my vacuum cleaner

So, I was doing some housework at home and yeah, listening to some Whitney Houston when the crazies thing happened (I don't do it often alright. But you gotta admit, she's got the voice). The vacuum cleaner was a-hummin' and Whitney Houston was a-yodeling when suddenly, it was clear as day, even the tone deaf would have caught it...Whitney Houston and my vacuum cleaner were belting the very same note! I couldn't believe it. And the vacuum cleaner didn't sound bad at all. Good ol' life.