For nearly 150 years, Gilbert and Sullivan have pervasively influenced popular culture in the English-speaking world. Lines and quotations from the Gilbert and Sullivan operas have become part of the English language, such as "short, sharp shock", "What never? Well, hardly ever!", "let the punishment fit the crime", and "A policeman's lot is not a happy one".

Musical theatre is a form of theatrical performance that combines songs, spoken dialogue, acting and dance. The story and emotional content of a musical – humor, pathos, love, anger – are communicated through words, music, movement and technical aspects of the entertainment as an integrated whole. Although musical theatre overlaps with other theatrical forms like opera and dance, it may be distinguished by the equal importance given to the music as compared with the dialogue, movement and other elements. Since the early 20th century, musical theatre stage works have generally been called, simply, musicals.