Question: Which American heavy metal singer, nicknamed "Ripper" from the Judas Priest song, "The Ripper", performs alongside guitarist Yngwie Malmsteen on his 18th studio album, "Relentless"?
Sentence (from "Inspiration (Yngwie Malmsteen album)"): Inspiration is the ninth studio album by guitarist Yngwie Malmsteen, released on 14 October 1996.
Relevant evidence: No