Sometimes, things in musical theatre can get a little weird. Or perhaps they were unusual from the start, and this is the logical conclusion. For whatever reason, every once in a while, a ghost is bound to pop up and sing a musical number, often as a warning or encouragement to TheHero. Sometimes the ghost is of someone who died in the course of the show, or of someone dead long before the overture. In any case, it can be a powerful device if used properly. These songs (and/or sequences) tend to be played for surrealism.

Subtrope of DeadPersonConversation, which is not necessarily musical, but which is based in the same principle. Compare TheDeadCanDance. Not to be confused with VideoGame/GhostSongAJourneyOfHope
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!!Examples:

* ''{{Carousel}}'' (Technically, anything [[spoiler: Billy sings after his death.]])
* Any musical version of ''Literature/AChristmasCarol'' is going to have at least one of these. Even if you don't count the spirits as ghosts for purposes of this trope (and its supertrope DeadPersonConversation), Marley nearly ''always'' has a song of his own.
* ''IntoTheWoods'' ("No More", when the Baker is visited by [[spoiler: his father, The Mysterious Man, who died at the end of Act One.]])
** Also, right before the Witch sings "Children Will Listen", [[spoiler: the Baker's Wife consoles her husband, who is unsure of how to raise their child on his own.]])
** Cinderella's Mother's sung parts in "Cinderella at the Grave" and the shoe fitting scene.
** All of the characters who reappear at the beginning of the final sequence, reprising the "One Midnight Gone" material and delivering their final morals, are ghosts. [[spoiler: This presumably includes the Steward, Cinderella's Father, Stepmother and family, who seemingly starved to death before they could find their "hidden kingdom" but excludes the Princes and their new Princesses.]]
* ''Theatre/LesMiserables'' (During the "Epilogue", the ghosts of [[spoiler: Fantine, and then Eponine]], visit [[spoiler: Valjean]] in his dying moments to usher him to the afterlife. The final number usually includes all the characters, living and dead.)
** Inverted with [[spoiler: "Empty Chairs At Empty Tables".]]
* ''PassingStrange'' (After The Narrator interrupts the idealistic Youth's "Passing Phase" with an abrupt [[SlidingScaleOfIdealismVersusCynicism slide to the other end of the scale]], [[spoiler: his dead Mother returns to stop his depressingly cynical thought process with simple encouragement. "It's all right."]])
* Almost all of Lily's material in ''Literature/TheSecretGarden'', especially "Come To My Garden", and a half-ghost duet "How Could I Ever Know".
** In addition, the GreekChorus ensemble is comprised of the ghosts of people Mary knew in India, including her parents.
* ''SpringAwakening'' ("Those You've Known," [[spoiler: in which post-suicide Moritz and recently-deceased Wendla convince Melchior to move on after Melchior discovers Wendla has died from an abortion of their child.]])
* ''Theatre/SundayInTheParkWithGeorge'' ("Move On", in which the spirit of his great-grandmother--the female lead of Act One--visits George [[spoiler: and tells him to stop [[TrueArtIsAngsty angsting]] over his work.)]]
* ''Theatre/SweeneyToddTheDemonBarberOfFleetStreet'' (The final reprise of "The Ballad" at the end of the show starts with all of the principles--most of whom are dead at this point--singing the first verse in turns, and it all ends with [[spoiler: the dead]] Todd and Lovett leading the company.)
* ''{{Urinetown}}'' (Arguably a flashback, but nevertheless, "Tell Her I Love Her" is a duet between Little Sally and [[spoiler: the dead hero Bobby, who has been [[ReleasedToElsewhere "sent to Urinetown"]], as she tells them his last words. Whether his joining in is part of a flashback or a ghost echoing Sally's words differs by production.]])
* "The Letter" from the musical version ''BillyElliot'' fits, being sung (in part) by Billy's dead mother.
* ''Theatre/FiddlerOnTheRoof'' has a weird meta example, as the song "Tevye's Dream" is about the lead pretending to have had a dream in which an GhostSong occurred, which he is now describing to his wife.
* Gleefully beaten to death in ''Moby Dick! The Musical''. Esta ''lives'' for this trope. (Er, well.. you know.)
* The title song in ''JesusChristSuperstar'' is sung by Judas, who has already hung himself.
* During a funeral in ''Antonia's Line'', the dead woman sits up and starts singing. However, this is implied to be simply her granddaughter's vivid imagination.
* {{Cats}} has [[OverlyLongName "Firefrorefiddle"]], a strange, specter-like entity, prancing about occasionally in the Gus the theatre cat song. It's not a literal ghost, but rather the memory of Gus's greatest role taking on a life of its own.
* Anything [[spoiler: Gabe]] sings in ''NextToNormal''. Especially the ironically-named "I'm Alive".
* "Painted Emblems of a Race" and "When the Night Wind Howls (Sir Roderick's Song)" from Creator/GilbertAndSullivan's ''Theatre/{{Ruddigore}}'', during which the ghosts get down from their painting to scare their descendant into being evil.
* In the reprise of "Wie Du" ("Like You") in ''{{Elisabeth}}'', the title character asks her father's ghost for guidance. He's unable to help her, just like in the version of the song in which he was alive.
* In Benjamin Britten's operatic adaptation of ''Literature/TheTurnOfTheScrew'', the ghosts of Peter Quinn and Miss Jessel definitely exist. Quinn's ghost seduces little Miles in a sensuous serenade, and at the beginning of Act 2, the two ghosts use a duet as an expository device.
* The finale song in ''Theatre/LittleShopOfHorrors'', "Don't Feed The Plants", is fittingly sung by the characters who were [[ManEatingPlant eaten by the plant]].
* In Woody Allen's film {{Everyone Says I Love You}}, the ghost of the grandfather interrupts his own funeral to sing "Enjoy Yourself", accompanied by other ghosts who dance out of the funeral home.
* The song "Grim, Grinning Ghosts" from the Disney attraction 'The Haunted Mansion' probably counts.
* Since ''Theatre/TheFix'' begins with his death, any song Senator Reed Chandler is in might qualify. Of course, one of those occasions is while his delinquent son Cal is on drugs, hence the ''might''.
* EmilieAutumn's RockOpera "Fight Like A Girl" has "Goodnight, Sweet Ladies", which is sung by Emily and an EtherealChoir of dead Asylum girls. "The Key", too, [[SoloDuet though you wouldn't know until you read the lyrics booklet.]]
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