A singer stretches a word.
The music covers part of the voice.
Two words run together.
Your brain still has to decide what was said.
Sometimes it makes a perfectly reasonable guess.
The guess is simply wrong.
Songs make speech harder to decode
Ordinary conversation already contains incomplete information.
In music, the problem gets bigger.
Pronunciation may change to fit melody or rhythm.
Background instruments compete with the voice.
A vowel may be held for several beats.
Words can blend together.
The brain fills in missing pieces
Hearing is not just sound entering the ears.
The brain constantly interprets that sound.
It uses context and familiar language patterns to decide what the speaker probably said.
Most of the time, this works extremely well.
Sometimes the brain chooses a phrase that fits the sound but was never actually sung.
Misheard lyrics have a name
They are often called mondegreens.
The term refers to lyrics or phrases that are heard incorrectly because the sound can support more than one interpretation.
Once the wrong version becomes familiar, it can be surprisingly hard to stop hearing it.
Why does the wrong lyric stick?
Familiarity gives the brain a strong expectation.
Once you have learned one version, your brain knows what it expects to hear next.
That expectation can shape later perception.
The same general tendency to lean on familiar patterns also helps explain why repeated exposure can make something feel more familiar and likable.
Why can the real lyric still sound wrong afterward?
Knowing the correct words does not instantly erase the old interpretation.
You may hear both versions depending on what you focus on.
The acoustic signal was ambiguous enough to support the mistake in the first place.
Is this evidence that your hearing is bad?
Usually not.
Misheard lyrics are a normal example of the brain interpreting incomplete information.
Everybody’s perception depends partly on expectations and context.
So your ears supplied the sound.
Your brain occasionally wrote the wrong lyric sheet.
And that’s the short explanation.
Related explanations: Why does a song get stuck in your head?, Why can a song bring back a memory?, and Why does confidence make someone seem believable?