Doo wop is a style of vocal-based rhythm and blues music that developed in the 1940s-1960s. It features vocal harmony with nonsense syllables, a simple beat, and little instrumentation. Typical instruments included the double bass, electric guitar, saxophone, drums, and piano. Doo wop emerged from African American communities in cities like New York, Philadelphia, and Los Angeles. Popular doo wop artists included The Clovers, The Coasters, The Drifters, and The Flamingos. Billy Joel's song "For The Longest Time" is discussed, along with positive reviews of how it calms babies and was used in a marriage proposal.