Your brain has to decode a moving sound
Speech does not arrive with neat spaces between words. In a sung line, sustained vowels, blurred consonants, melody, and loud instruments can make the boundaries even harder to locate. The sound reaching your ears may fit more than one plausible sequence of words.
Your brain does not wait for every consonant to become perfectly clear. It combines the sound with context—what the song is about, which words commonly follow one another, and what syllables seem to fit the rhythm. That helps you understand speech in noisy rooms, but it can also steer an ambiguous lyric toward a phrase you already know.
Why one version sticks
Once a phrase makes sense, it becomes a kind of listening template. On the next play, your attention is ready for those words, so the same blurred sound can seem to confirm them. This is not simply a failure to hear: perception is an interpretation built from both sound and expectation.
The effect can be especially strong when the mistaken phrase forms a vivid little scene or joke. A memorable interpretation is easier to retrieve than a string of uncertain syllables, so it may keep winning even after someone tells you the intended words. Seeing the official lyric can change what you hear, though it may take focused listening to separate the singer’s consonants from the version your mind has learned.
That is why a lyric can feel unmistakable and still be wrong: the brain has made the music intelligible by choosing one of the meanings its sound allows.
