The term 'Doo-Wop Music' is a style of popular music that originated in the 1950s. It is characterized by vocal harmony, simple instrumentation, and a basic chord structure. The term 'Doo-Wop' comes from the sound of the vocal harmonies, which often include nonsense syllables such as 'doo-wop'. The crossword solution for this term is 'WOP', which stands for 'without percussion'. This refers to the fact that Doo-Wop Music is typically performed without drums or other percussion instruments.