(For those of you unfamiliar with the name, here's the Wiki article.)
http://en.wikipedia.org/wiki/Earworm
Today it's Johnny Winter's "Ain't Nothin To Me" - which is easy to deal with, because I can play the CD, listen to it, process it and SCRATCH THAT EARWORM!
That's the only way I've figured out how to deal with them - to listen to the piece. Because if I don't, it's going to loop around and around in my brain. And not the whole song, usually just a fragment.
Sometimes it's kicked off by hearing a brief bit of the music. A lot of times it can be started by even a textual reference or a passing visual reference. (You KVRers are GREAT at posting stuff that starts an earworm.
One of my very worst earworms is a popular Christmas song by B*rl I*es. Every year I get nailed in a supermarket or a store that's playing it on the and it starts off an earworm that lasts for days, looping endlessly in reassembled fragments. I hate that song.
But what's got to be the worst is when I wake up with one that I can't identify. A couple years back one nailed me and hung on for a week and I did not know what it was. It drove me nuts. Finally, somehow I identified it as Michael Nyman's creaky organ closing credits to the film "Ravenous". I went to Youtube and scratched that sucker.
There is definitely something wrong with my brain.