Wiegenlied is the German term for a lullaby, a form built on simple, repeating melodies meant to soothe children to sleep. The most famous example is Brahms' Wiegenlied, Op. 49 No. 4 from 1868, which helped define the sound listeners now associate with rocked cradles and music boxes. Short clips using the name circulate online as shorthand for that tradition, appearing in edits, soundboards and family videos where a second of gentle melody is enough to set a bedtime mood without playing a full song.