American rock band that originated in 1979 in Springfield, Missouri, who combine progressive metal, funk and soul with vocal arrangements influenced by gospel, blues, and British Invasion rock groups. Despite a largely underground reputation as the "musician's musicians", King's X was pivotal in the early development of progressive metal, and produced a series of early records considered essential within the genre. The band's lyrics are largely based on the members' struggles with religion and self-acceptance. King's X was ranked No. 83 on VH1's 100 Greatest Artists of Hard Rock.