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Walls of Jericho is the debut studio album by German speed metal band Helloween, released in 1985 on LP by Noise Records. It stands as the band's only album featuring Kai Hansen as lead vocalist until the release of Helloween in 2021, though he continued to serve as guitarist on the two albums that followed. When the album was released on CD in 1988, its enhanced storage capacity allowed for the addition of the Helloween EP and mini-LP, as well as the song "Judas" from the Judas EP, transforming it into a compilation. In the late 1980s, a manufacturing error resulted in some cassette copies containing the wrong music on side one, with several copies accidentally featuring Celtic Frost's To Mega Therion instead, which caused confusion among first-time listeners discovering Helloween.