Welcome, Larry!

I have this tune-problem (melody malady, as Bridget said) quite often. But I tend to express it out loud, often with the wrong words (or new words, as the mood takes me), which drives my husband bananas. Sometimes, to exorcise the demon, it is sufficient to find the CD and play the song, and allow the natural progression to the next song. Or play the song on an instrument, depending, of course, on the song itself.