It uses the sarabande from the 5th suite for solo cello by Bach .
Each of Bach 's cello suites contains a sarabande , and the film uses the sarabande from his fifth suite , which Bergman also used in Cries and Whispers ( 1971 ) . The sarabande from the second Bach suite serves as the primary theme in Bergman 's Through a Glass Darkly ( 1961 ) .