I always get 'stuck' on a particular song. Why? Does anyone else do this? Is it normal?

I simply cannot change it, so i put it on repeat if i realise that i'm stuck on it.. or i always go back onto it when the song ends. i've been listening to this one song on repeat for the past three or so hours without stopping, and yesterday for around the same amount of time.

I want to listen to other songs but my mind won't let me.... it sounds weird and discordant if I change songs... and I keep on skipping until I get the point and go back to that song.