broken reccord

I love to sing, and when I'm alone I will often sing on and on without even really thinking about it, so much that I wear myself out and start to find myself annoying. One of the most vexing things is that my brain seems to get stuck on just a few tunes. And it's not like it's one tune for a while and then another one, and so forth...it's the same tunes for years and years. I wouldn't know the statistics but it's a good bet when I open my mouth one of about three tunes will pop out: Think of Me, and Angel of Music from Phantom of the Opera, or Greensleves/What Child is this. Sometimes I think I would punch myself in the mouth if it were possible when one of those insists on blocking all other tunes from my mind. I'll stand there wanting to sing but not being able to make a peep unless it's one of those three, yet again. Or I'll suddenly find myself singing one of them for the 10th time that day and get the urge to just let out a blood curdling scream. I actually really like all those tunes, and I do enjoy singing them, just not over, and over, and over, and over, and over, and over, and over, and over......