Your ears are not entirely to blame. Hill explains the speech-to-song illusion, which a repeated phrase tricks your brain thinking it’s a song. Your brain kicks into overdrive looking for musical patterns. Sometimes you might experience the Triton paradox, which a sequence of notes are a half-tone apart, and it may sound like a different pitch to you. Or perhaps two separate sounds are coming from the left and right speakers it sounds like a familiar word. This illusion is called phantom word illusion. Perhaps this is why we mishear lyrics? You may also experience the phoneme restoration effect when there’s noise in parts of speech, but your brain fills in the gaps, and you still know what’s being said.
Check out the related video by Reactions: Why Do We Love Music?