Overture (French ouverture, "opening"; German Ouvertüre, Vorspiel, i.e., "prelude", lit. "play before") in music is the term originally applied to the instrumental introduction to an opera. During the early Romantic era, composers such as Beethoven and Mendelssohn began to use the term to refer to independent, self-existing instrumental, programmatic works that presaged genres such as the symphonic poem. These were "at first undoubtedly intended to be played at the head of a programme".

"Once More, with Feeling" is the seventh episode of the sixth season of the supernatural drama television series Buffy the Vampire Slayer (1997–2003) and the only one in the series performed as a musical. It was written and directed by the show's creator, Joss Whedon, and originally aired on UPN in the United States on November 6, 2001.