Needs a Better Name
- a work that contains one song and one song only. It also has to be sung by the cast in the style of a musical, not just on the soundtrack. This is sometimes a Big Lipped Alligator Moment
- Life of Brian - "Always Look On The Bright Side OF Life"
- The other Monty Python films contained musical numbers, but not enough to call them musicals.
- Robin Hood Men In Tights. "The night is young, and you're so beautiful. B flat, please."
- The film Easy A subverts this by discussing it as a trope of 80's films, specifically Ferris Bueller's Day Off. There is a musical number in Easy A, by the way.
- Beetle Juice contains a song and dance number where the cast is possessed.
- Tank Girl. The protagonists and the guests and dancers of Liquid Silver sing Cole Porter's "Let's Do It" as an old-style production number.
- The romantic-comedy 10 Things I Hate About You featured one and only one song & dance routine late into the first act.
- "Meglio Stasera" in The Pink Panther.
- A full season after the Musical Episode of Buffy the Vampire Slayer, the episode "Selfless" included a flashback to the time period, which contained one new song.
- The Fiendish Plot Of Doctor Fu Manchu: Fu Manchu has a rock-n-roll musical number after he gets revitalized into a young(er) man.
- The inevitable Bollywood number at the end of Slumdog Millionaire.
"The Inquisition," the Busby Berkeley Number in History Of The World Part I.
- A lot of Family Guy episodes contain a single song and dance number. Particularly the ones where Brien and Stewie are traveling around.
- Some South Park epesodes do this as well.
- The first season of Campus and the British Skins ended on a musical number by the cast
(Eternal Flame and Wild World)
- Phineas and Ferb always has one song towards the middle, repeated in the credits