Wikipedia: Doo-wop (sometimes doo-wopp) is a style of vocal-based rhythm and blues music developed in African American communities in the 1940s, achieving mainstream popularity in the 1950s and early 1960s. It emerged from New York, Philadelphia, Chicago, Baltimore, Newark, Pittsburgh, Cincinnati, Washington D.C and areas of greater Los Angeles, including El Monte and Compton. Built upon vocal harmony, doo-wop was one of the most mainstream, pop-oriented R&B styles of the time. Singer Bill Kenny is often noted as the father of Doo-wop for his introduction of the "top & bottom" format used by most Doo-wop groups. This format features a high tenor lead with a "talking bass" in the song's middle.
doo-wop noun Popular Music. a style of small-group vocal harmonizing, commercialized as a type of so-called street singing in the 1950s, in which words and nonsense syllables are chanted in rhythmic harmony to support the stylized melody of the lead singer.