Chills in the chapel

After tomorrow night’s Halloween Organ Concert, you might have pipe nightmares instead of pipe dreams. Minister of Music Harry L. Huff will play flesh-crawling renditions of music from “The Phantom of the Opera,’’ “Harry Potter and the Sorcerer’s Stone,’’ “The Exorcist,’’ “Alfred Hitchcock Presents,’’ and more, ending with Bach’s Toccata and Fugue in D minor. Huff will be accompanied by candlelight and cellist Sam Ou. Costumes are optional. Oct. 31 at 7 p.m. Free. Old South Church Gordon Chapel, corner of Boylston and Dartmouth streets, Boston. 617-536-1970. www.oldsouth.org