I thought the lyrics to "Single Ladies" were "If you liked it, then you should've put your name on it."
I used to believe that the lyrics to Mull of Kintyre were bollocking time
There's a song which has lyrics that are basically just a bunch of actions followed by "Rawhide" and then it starts again.
Up until I was *seventeen*, I had only heard of rawhide as that stuff you give dogs to chew on, so I thought that it was akin to have a song where you shout, "Dog food!" at random intervals, so the song made no sense to me.
Up until I was like 7 or 8, I thought the lyrics to the song "Last Christmas" were, "Last Christmas, I gave you my harp..."
I used to listen to this song at school, and the lyrics were things like "Welcome back" and "We're proud of you". I thought it was about a girl (no idea why I specifically thought she was a girl) graduating a boarding high school, and it was sung by her parents.
Later, I learned that it was about welcoming soldiers back after a war, but I thought my version was better.
When I was a child, I used to believe the singer or the music group lived in my CD's and they allowed to sing (and live) only when I wanted.
My cousin used to think that a group of nine singers was called a "niner".
"Achy Breaky Heart" by Billy Ray Cyrus was popular when I was a kid. However, I misunderstood the line "He might blow up and kill this man." I thought "this man" was referring to some other specific man - in short, that his heart would explode so violently as to cause collateral damage.
I thought Total Eclipse of the Heart went "nothing I can see, total eclipse of the sun".
I thought the "physically fit" lines in the song "I Like to Move It" were "fizzy coloured feet".