ballad n.

"dancing party, social assembly for dancing," 1630s, from French, from Old French baller "to dance," from Late Latin ballare "to dance," from Greek ballizein "to dance, jump about," literally "to throw one's body" (ancient Greek dancing being highly athletic), from PIE root *gwele- "to throw, reach." The extended meaning "very enjoyable time" is American English slang from 1945, perhaps 1930s in African-American vernacular.

late 14c., an earlier borrowing of ballad (q.v.) with a specific metrical sense. Technically, a poem consisting of one or more triplets of seven- (later eight-) lined stanzas, each ending with the same line as the refrain, usually with an envoy. Popularized 19c. as a type of musical composition by Frédéric Chopin. Ballade royal, in which each line consists of ten syllables, is recorded from late 15c.