''On a Clear Day You Can See Forever'' is a 1965 musical comedy with book and lyrics by Alan Jay Lerner and music by Burton Lane.

Daisy Gamble is 22 years old and, though seemingly ordinary, expresses some uncanny abilities, particularly over plants. Daisy goes to visit Dr. Mark Bruckner, an experienced hypnotist, to see if he can help cure her of her cigarette addiction. By hypnotizing her, Dr. Bruckner finds out not only about her early life, but about her previous life in the 18th century as a young English lady named Melinda Welles and her four years of marriage to Sir Edward Moncrief, a rakish portrait painter.

The 1970 film version was directed by Creator/VincenteMinnelli, starred Music/BarbraStreisand and Yves Montand, and featured a considerably revised screenplay and new {{Movie Bonus Song}}s by Lerner.

!!Tropes appearing in this musical:

* AdaptationNameChange / AdaptationalNationality: In the film version, the Austrian Dr. Mark Bruckner becomes the French Dr. Marc Chabot.
* ArrangedMarriage: Melinda's family makes elaborate preparations for her to marry Sir Hubert Insdale. She quashes the proposal simply by saying "no" to him.
* DisposableFiance: Daisy's blandly perfect fiancé, the perfectly bland Warren Smith.
* DistantDuet: In the film version, when Daisy is avoiding the psychiatrist and he tries to reach her telepathically, she begins hearing the words of the song "Come Back to Me" coming from the mouths of her cooking class teacher, police officers, and other random strangers.
* FunnyForeigner: Themistocles Kriakos, an eccentric Greek millionaire who speaks broken English and is more than eager to fund serious research on reincarnation.
* LovingAShadow: Mark falls in love with Melinda, though she only exists in Daisy's unconscious recollections.
* MySisterIsOffLimits: Edward invokes this with the song "Don't Tamper With My Sister," though the complaint here is just that it's in public (and Edward is only [[BoyfriendBluff pretending to be her brother]] anyway).
* OohMeAccentsSlipping: Daisy's British accent starts to fade when she stops recalling memories of her previous life in 18th-century England.
* PsychicPowers: Daisy's demonstrated psychic powers include knowing where other people's car keys are and making flowers grow really fast.
* {{Reincarnation}}: Mark probes into Daisy's unconscious memories of her past life in 18th-century England as Melinda Welles.
* TalkingToPlants: Daisy does this in the song "Hurry! It's Lovely Up Here."
* TitleThemeTune: In a rare musical theatre example, the prelude features the title song sung by an offstage chorus.
* UnreliableVoiceover: Daisy's narration of her 18th-century flashbacks often contradicts the immediate happenings.