 In contrast to other subgenres doom metal, influenced by Gothic rock, slowed down the music, with bands like England's Pagan Altar and Witchfinder General and the United States' Pentagram, Saint Vitus and Trouble, emphasizing melody, down-tuned guitars, a 'thicker' or 'heavier' sound and a sepulchral mood.American bands such as Queensrÿche and Dream Theater pioneered an often instrumentally challenging fusion of NWOBHM and progressive rock called progressive metal, with bands such as Symphony X combining aspects of power metal and classical music with the style, while Sweden's Opeth developed a unique style indebted to both death metal and atmospheric 1970s prog rock.Rock, mostly the heavy metal genre, has been criticized by some Christian leaders, who have condemned it as immoral, anti-Christian and even demonic.