Toccata and Fugue in D Minor, Bach-Werke-Verzeichnis 565
Johann Sebastian Bach (Saxe-Eisenach, now Germany), 1685-1750.
One of the popular compositions out there, by perhaps the best of all classical composers. I am not not specially fan of this composition, but it is a must. It is an organ composition that is usually linked to horror movies, specially since the film adaptation of The Phantom of the Opera.