"The Call of Ktulu" is the eighth and last song of the album Ride the Lightning. It is the second instrumental track written by Metallica, and the last song credited to Dave Mustaine. The title refers to H.P. Lovecraft book "The Call of Cthulhu", misspelled "Ktulu" in fear of the beast. Also because James Hetfield wanted to let the fans know how to pronounce the name.[citation needed]