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Dong-yo (동요) is the Korean tradition of children’s songs, written to be easily sung by young voices in school, home, and community settings. Melodies are diatonic or pentatonic, with stepwise motion, narrow ranges, and clear, memorable refrains that encourage group singing. Texts typically explore nature, the seasons, animals, family life, and simple moral or educational themes, often using onomatopoeia and playful rhythms. Musical language blends Western tonal harmony (I–IV–V progressions) introduced through mission schools and modern education with traces of Korean folk modality and rhythm. Dong-yo exists both as a repertoire of classic songs from the early to mid‑20th century and as a living practice that continues through children’s choirs, classroom music, educational media, and animated series.

A lullaby is a soothing song or instrumental piece intended to calm and help infants or young children fall asleep. It is typically slow, soft, and repetitive, with a narrow melodic range and gentle rhythms that mimic the rocking motion of cradling. While lullabies exist in virtually every culture, they share common musical traits: simple harmonies (often I–IV–V progressions), stepwise melodies, and meters such as 3/4 or 6/8 that suggest sway. Lyrics often reference sleep, safety, night-time imagery, and parental care. In classical contexts, the term “berceuse” (French for lullaby) denotes a lullaby-like character piece.