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.Once More, with Feeling" explores changes in the relationships of the main characters, using the plot device that a demon—credited as "Sweet" but unnamed in the episode—compels the people of Sunnydale to break into song at random moments to express hidden truths. The title of the episode comes from a line sung by Sweet; once the characters have revealed their truths and face the consequences of hearing each other's secrets, he challenges them to "say you're happy now, once more, with feeling".