 Judas Priest 's " <unk> <unk> " is the only cover version to appear on a Slayer studio album . The song was chosen due to its war @-@ themed lyrics . Hanneman described the track as " more just like one of those odd songs that a lot of people didn 't know , but it was a favorite of Kerry and I , so we just picked that one . " Meanwhile , " <unk> the Soul " has been heavily criticized by King who said that he hates the track : " That 's one of the black marks in our history , in my book . I just fucking think it 's horrible . [ Laughs ] I hate the opening riff . It 's what we call a ' happy riff . ' It 's just like ' la @-@ <unk> @-@ la @-@ la @-@ la . ' I can 't see myself playing it , but after that , where it gets heavier , I like that section . If we ever did a medley , I 'd put part of that in there . " The Slayer <unk> Soundtrack to the Apocalypse featured , along with four songs of the album , an early version of the title track , recorded at Hanneman 's home . 
