What is a lullaby?
A lullaby is a gentle, soothing song used to lull a child to sleep — one of the oldest kinds of music humans make, found in every culture on Earth.
The meaning of the word
The word lullaby comes from Middle English lullen — to soothe or quiet with soft sounds (the same root as "lull") — joined with by or bye, the drowsy syllables parents have always sung: lulla-bye. The word is, quite literally, the sound of soothing written down.
Many languages built their word for it the same way, from the syllables parents actually sing — Spanish nana, Italian ninna nanna, Russian bayu-bay. Different sounds, same instinct.
What makes a song a lullaby
A lullaby is defined by how it sounds, not what it says. Almost every lullaby, from any century or culture, shares the same recipe:
- Slow — around 60–80 beats per minute, near a resting heartbeat.
- Soft — sung or played quietly, with no sharp edges.
- Repetitive — short phrases that circle and return, easy to sink into.
- Simple — a small melody, often rocking gently between two feelings, like a cradle.
Words are optional. Humming works. A music box works. That's why instrumental lullabies — like the ones below — are lullabies in every way that matters to a sleepy baby. And the recipe genuinely works: it cues sleep, soothes, and masks noise — we unpack the mechanics in how lullabies help babies sleep.
A very short history
Lullabies are ancient — a Babylonian lullaby survives on a clay tablet some 4,000 years old, and virtually every culture since has sung its own. Most were passed down orally, mother to child, which is why so many exist in endless local variations. The most famous written one arrived in 1868, when Johannes Brahms published his Wiegenlied — the tune almost everyone alive can hum today. You'll find it and its companions in our guide to classic lullabies.
Hear one now
Theory is nice; here's the real thing. Tap to play a gentle, modern lullaby:
Tip: The Lullaby app loops any lullaby seamlessly all night and fades it out with a sleep timer.
4,000 years of practice, one tap
Free gentle lullabies. Repeat + sleep timer in Premium. No ads, ever.
Frequently asked
What is the meaning of lullaby?
A gentle, soothing song used to calm a child and help them fall asleep — from Middle English lullen (to soothe with sound) + bye.
Does a lullaby have to have words?
No. Slow, soft and repetitive is what counts — humming, music boxes and instrumental melodies are all true lullabies.
Why does every culture have lullabies?
Because every culture has tired babies and tired parents. The same recipe — slow, simple, repeated — was discovered independently everywhere, because it works.
Where do I start?
With one gentle track played consistently — our picks are in the best lullabies for babies.