Emily Rossum sings aria Think of me from The Phantom of the Opera (original title: Le Fantôme de l'Opéra), that's a novel by French writer Gaston Leroux. It was first published as a serialization in Le Gaulois from September 23, 1909 to January 8, 1910. Initially, the story sold very poorly upon publication in book form and was even out of print several times during the twentieth century, despite the success of its various film and stage adaptations.
The most notable of these were the 1925 film depiction and Andrew Lloyd Webber's 1986 musical. The Phantom of the Opera musical is now the longest running Broadway show in history, and one of the most lucrative entertainment enterprises of all time.
From The Phantom of the Opera [Blu-ray] with Gerald Butler.