When I have a song pop into my head, I imagine smashing the 45 with my fist and I am in peaceful bliss. Or I imagine myself playing chess on an island in the ocean so all I hear is the crashing of waves.
How to get songs out of your head
I have mastered the art of ridding myself of unwanted mind-music throughout many long car rides! I am quite good with my concentration. Usually I just change it to a song I actualy like, but if I don't want any of the music, I can just concentrate on something that happened recently, and after 30 seconds or so, I'm free!
If I have the song I just listen to it over and over, instead of singing it in my head if I hear it 4-5-6 times in a row I get tired of it, when I stop playing it it's not stuck in my head anymore