Is it normal to have this song stuck in my head?

I had watched The Producers a long while back, but I remembered the "Springtime for Hitler" song. I didn't remember the lyrics, but when I Youtube searched it, I really loved it. I listened to both versions, from 1968 and 2005. I even made my very own mix, including my favourite parts of both versions. I have had the song stuck in my head for about a week, I dance to it when I'm alone in my room, heck, I even sang it aloud once. I know in the Producers this song was made to start off the parody play making fun of Hitler and all, but the song doesn't make fun of the Nazi lifestyle much. Is this normal?