A genre (usually a cappella) of Black vocal-harmony music of the 1950s that evolved in New York City from gospel singing; characterized by close four-part harmonies; the name derived from some of the nonsense syllables sung by the backup WordNet 3.0 & Open English WordNet

Doo-wop is a genre of rhythm and blues music that originated in African-American communities during the 1940s, mainly in the large cities of the United States, including New York, Philadelphia, Pittsburgh, Chicago, Baltimore, Newark, Detroit, Washington, D.C., and Los Angeles. Wikipedia

Style of rhythm and blues Wikidata

A style of vocal-based rhythm and blues music popular in the mid-1950s to the early 1960s in America characterized by nonsensical backing vocals. Wiktionary