When you take a song and convert it to MIDI and back, you shouldn’t be able to make out words, yet some people can. Which ones can you make out? There’s a link to an explanation below, but the phenomena isn’t fully understood. Try it before reading the science behind it:

Mariah Carey’s All I Want For Christmas is You

Drake’s Hotline Bling

Smash Mouth’s All Star

According to this New Scientist piece, this is an example of what psychologists call “top-down processing”, wherein the brain uses information it already has to try to understand the world around it. So chances are, if you haven’t heard the song before, you won’t hear the words. But if you have heard it, you probably will.