Pino Donaggio (Carrie) Carrie

Donaggio replaced Bernard Herrmann after Herrmann died

Brian De Palma had intended Bernard Herrmann -- who scored Psycho, Vertigo, and North by Northwest for Hitchcock -- to compose the music for Carrie. Herrmann died on December 24, 1975, the night of the final recording session for his score for Taxi Driver. De Palma turned to Pino Donaggio, an Italian composer who had scored his previous film Obsession (1976) and who had begun his career as a pop singer in Italy before transitioning to film scoring in the early 1970s. (mubi, wikipedia)

Donaggio scored Carrie as a tragedy, not a horror film

Donaggio's central interpretive decision was to treat the material as drama rather than genre horror. He believed the film was more concerned with the tragedy of Carrie's existence than with scaring the audience, and he composed accordingly -- building the score around romantic, tender melodies rather than sustained dread. (mubi)

The "Theme from Carrie" -- the score's emotional anchor -- features slow, gentle woodwinds that build into a romantic melody. It functions as Carrie's emotional signature, returning throughout the film in fragments and variations during moments when other characters show her compassion: Collins in the mirror, Tommy at the door, the compliments at the prom. The theme plays the kindness arc, not the horror arc.

The score uses different instrumental palettes for different emotional registers

Donaggio tailored the orchestration to match each scene's emotional function:

• Carrie's tenderness: The main theme, scored for woodwinds, strings, and piano, accompanies moments of vulnerability and connection.
• Miss Collins's warmth: In the mirror scene, the theme is stripped down and re-orchestrated using acoustic guitar and Rhodes keyboard instead of strings and piano, creating a warmer, more intimate sound.
• Margaret's religious oppression: A church organ accompanied by unsettling low-register tremolo strings connects Margaret's fanaticism directly to Carrie's supernatural powers.
• Telekinetic events: Donaggio employed "stabby" string stingers reminiscent of Herrmann's Psycho score whenever Carrie uses her powers or feels threatened -- a direct homage to the composer who was supposed to have scored the film.

(mubi)

The prom climax interweaves sentimentality and menace

During the prom sequence, Donaggio layers sentimental love ballads over increasingly ominous strings, mirroring Carrie's psychological state as the best night of her life approaches catastrophe. Glockenspiel and dissonant chords signal the fading of innocence. When the blood falls, the romantic instrumentation drops away entirely, replaced by the Herrmann-derived stabbing strings -- the tragedy gives way to the horror it was holding at bay. (mubi)

Carrie launched a five-film collaboration with De Palma

Carrie was the first of five consecutive De Palma scores for Donaggio: Home Movies (1980), Dressed to Kill (1980), Blow Out (1981), and Body Double (1984) followed. Each score adapted Donaggio's romantic sensibility to different genre material -- from the giallo-inflected eroticism of Dressed to Kill to the melancholy restraint of Blow Out. The collaboration established Donaggio as De Palma's preferred composer during the director's most productive decade. See Pino Donaggio (Blow Out) and Pino Donaggio (Body Double) for the later scores. (wikipedia)