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.
a folk-based but urbanized form of black popular music that is marked by strong, repetitious rhythms and simple melodies and was developed, in a commercialized form, into rock-'n'-roll.
