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||The name or term "Op.13" should not be confused with Slash (music).
Op.13 (Opus 13) is a music track composed by Jigokuguruma Nakamura and introduced in the 1993 NEC PC Engine game Castlevania: Rondo of Blood as the music for the the stage 5' and Dracula X Stage 5 music.
- A common mistake, first made by Konami itself, is the confusion between the tracks Slash and Op.13, due to an issue on the back cover of the soundtrack Akumajo Dracula X.