It happens to me all the time, especially with themes from my youth. After watching a documentary about sport programmes of the 70's, I could NOT shift the World of Sport or Grandstand themes out of my head for weeks! I was quietly singing them all day.
Oh God, they're back...
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I did recently have the song that was featured at the end of the final ever episode 'When You're Gone' stuck in there.
ALL THE TIME. In fact I have it in my head now.
https://www.youtube.com/watch?v=agZXWlx9_7E
Also, after copying loads of old stuff from VHS to hard drive, Central TV's electric guitar + drum jingles!
Oh God, they're back...
Bread
The Littlest Hobo
The Golden Girls
Different Strokes
Big Break
Dukes Of Hazard
Fresh Prince
Mr Ed