This is a very cool and catchy instrumental track, the first of only four that were ever done by Iron Maiden. (The others are 'The Ides Of March', 'Genghis Khan', and 'Losfer Words (Big 'Orra)').

Other than the title, there aren't any clues to what the song is about. Transylvania, however, is a real place located inside modern-day Romania. It was made famous as the setting for Bram Stoker's (18471912) classic vampire novel Dracula, which has been made into numerous movies, the best of which being probably Bram Stoker's Dracula (1992), directed by Francis Ford Coppola.

It is likely that the song was somehow inspired by the Dracula story, itself inspired by the life of Vlad Tepes, the ruthless ruler of Wallachia in the 15th century. It is not clear why Stoker used this historical character as a basis for his story, as there is no evidence that the man was drinking any human blood depite all the atrocities he committed.