You hear a song on the radio while driving. Hours later, you're making dinner, and there it is again. The same chorus, playing in your head. You haven't touched the radio since morning.
“I've got an earworm!”
Despite its creepy name, an earworm isn't a real worm. It's a fragment of music that replays in your mind without your permission. Familiar melodies can return automatically through musical memory, especially after recent exposure. Scientists call this involuntary musical imagery.
But why does one song disappear while another practically moves in?
Why Do Some Songs Get Stuck in Your Head?
The word earworm comes from the German Ohrwurm, literally meaning “ear worm.” It's an oddly perfect name for a tune that moves into your head and refuses to pay rent.
Some songs seem particularly good at finding a place to stay. In a 2017 study, researchers compared songs frequently reported as earworms with other popular songs. Earworm songs tended to have faster tempos and melodies with familiar overall shapes but unusual musical details.
Imagine a melody rising and falling as expected, then making a surprising leap. It's easy to follow but distinctive enough to remember. That doesn't give songwriters a guaranteed formula: familiarity, recent listening, and personal associations matter, too.
An earworm doesn't even need the whole song. You might forget the second verse completely yet hum the same five notes while waiting for the microwave.
So how can a few notes keep playing when there's no music around you?
Your Brain Has a Playlist of Its Own
Imagine someone playing the opening notes of a song you know by heart, then stopping. You can probably continue it without hearing another sound.
That's musical memory at work. It helps you recognize familiar tunes and anticipate what comes next. An earworm draws on that ability without waiting for you to ask.
Its trigger might be surprisingly ordinary: a word from the lyrics, a place you associate with the song, or music you heard earlier. Sometimes you can trace the connection. Other times, a chorus appears while you're folding laundry, and you have no idea why.
A 2020 review brought together 47 studies from 33 papers on involuntary musical imagery. It identified several influences, including familiarity, exposure, attention, and differences between listeners. But researchers still can't predict exactly which song will return at a particular moment.
That uncertainty is part of what makes earworms so peculiar. Your memory can summon a remarkably recognizable tune, but it doesn't always let you choose when.
Especially when you're trying to sleep.
Why Songs Get Stuck in Your Head at Night
You've turned off the lights, put down your phone, and settled into bed. Then your brain decides it's time for an encore.
In 2021, Baylor University researchers explored the relationship between earworms and sleep. They surveyed 199 people and conducted a separate sleep-laboratory study with 50 participants.
In the laboratory, participants listened to familiar popular songs before bed. Some heard versions with lyrics; others heard instrumental versions of the same songs.
You might expect music without words to be less distracting. Instead, instrumental versions produced more nighttime earworms and were associated with poorer sleep in the experiment. Sleep-related earworms were also linked with difficulty falling asleep, more awakenings, and changes in sleep stages.
Apparently, removing the singer doesn't always silence the song.
This doesn't mean all instrumental music is bad for sleep. The experiment used particular songs under controlled conditions. But it does challenge the assumption that music stops affecting us as soon as we turn it off.
And if the tune arrives at the worst possible moment, can you make it leave?
How to Get a Song Out of Your Head
You could try ignoring it. Or you could reach for a piece of chewing gum.
Yes, gum.
In 2015, researchers at the University of Reading ran three experiments to see whether chewing could interfere with musical thoughts. After participants heard catchy music, the researchers tested musical recollection under different conditions.
Chewing gum reduced both deliberate and unwanted musical recollections, as well as the sensation of mentally hearing the tune. The researchers suggested that chewing interferes with processes involved in planning speech movements, which may also help us silently recreate music.
In simpler terms, keeping your jaw busy might make it harder to rehearse that stubborn chorus.
It's a delightfully low-tech finding, not a guaranteed cure. Laboratory results can't tell us that gum will work for every earworm in everyday life.
Besides, not every earworm is unwelcome. Some tunes are irritating; others are comforting or simply pleasant. The very ability that interrupts your concentration can also bring back a song you love.
Think again about that chorus returning while you're making dinner. A few hours earlier, it was sound coming from your car speakers. Now it's something your memory can recreate, complete with a rhythm you recognize and a melody you can almost hear.
The surprising thing isn't only that a song gets stuck. It's that your brain can turn a passing moment of listening into a private performance.
You may not have pressed play.
But your brain clearly did.
References: Psychonomic Bulletin & Review · Psychology of Aesthetics, Creativity, and the Arts · Psychological Science · Quarterly Journal of Experimental Psychology
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