illustration from The April Baby’s Book of Tunes, by Kate Greenaway
Wikipedia

A lullaby is a song designed to soothe young children to sleep, the best-known of which is probably “Hush-a-bye, baby, on the tree topPerhaps the best-known English lullaby, the earliest known version of which was published in about 1765.“; lullabies are also known as cradle songs.[1]

There are also instrumental lullabies, such as Chopin’s Berceuse.[2]

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