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The track "The Call of Ktulu" appears on Metallica's second studio album, "Ride the Lightning," released in 1984. It is the fourth track on the album. The song is an instrumental, meaning there are no lyrics, and is a tribute to the horror writer H.P. Lovecraft and his story "The Call of Cthulhu." The track showcases the band's musical prowess and is a highlight of the album.