Oh yes - same song or same bit of a song.
I can't stand repeat though, I have to manually start it again though, it maybe has to be started at a certain point or stopped at a certain point such as a favourite part, the timing has to be just right and I have to feel just write about it - say for example if I'm distracted at the second I repeated it from I have to restart it again at that point. It often has to be repeated to the part that I would sing - I never sing, it just has to be something I could imagine myself singing - I have a whole imaginary band and gig in my head, we have a very eclectic play list
Right now I have an obsession with Nicki Minaj (I'm normally a rock fan, although generally quite eclectic tastes) - Knockout with her and Lil Wayne, first verse of Roger That with Young Money and just before her verse of Monster by Kanye West. Knockout was also repeating in my head for a good few days too.
Lucky for everyone else I can only really listen properly to music if on my MP3 player while I'm walking, or by watching music videos on my laptop at night with my headphones in, so no one else has to deal with my constant repeating.
A favourite song (all-time) is determined on how much I still like it after hearing it a few million times.