I've been listening to Christmas music in my car and my desk at work since a couple weeks before Thanksgiving.  I've noticed that I don't know the lyrics to any of the songs.  I find myself humming a lot and just flat out making up words.  It's very therapeutic and I highly recommend it.  I often arrive at my destination with a slightly sore throat due to singing at the top of my lungs.  I've even busted out in some Latin lyrics from my grade school days for an entire stanza of a certain holiday classic.  Have you ever been caught at a traffic light performing a solo?