An operatic showstopper is a powerful and dramatic song from an opera that stops the show. The term is derived from the Italian word 'ARIA, ' which means air or melody. An ARIA is a self-contained piece for one voice, usually with orchestral accompaniment. It is often used to express a character's emotions or to advance the plot of the opera. Showstoppers are typically performed by the lead singer and are often the most memorable part of the opera.