The term 'Barbershop Band' refers to a type of vocal music that originated in the United States in the late 19th century. It is characterized by four-part harmony, with the lead singer singing the melody and the other three singers providing the harmony. The term 'STROP' is a five-letter word that refers to a leather strap used for sharpening razors. It is often used as a metaphor for the tight harmonies of barbershop bands.