Heavy metal music styles in its early years, but by 1969 vocalist Ian Gillan and guitarist Ritchie Blackmore had led the band toward the developing heavy metal style. In 1970, Black Sabbath and Deep Purple scored major UK chart hits with "Paranoid" and "Black Night", respectively. That same year, two other British bands released debut albums in a heavy metal mode: Uriah Heep with "...Very 'Eavy ...Very 'Umble" and UFO with "UFO 1". Bloodrock released their self-titled debut album, containing a collection of heavy guitar riffs, gruff style vocals and sadistic and macabre lyrics. The influential Budgie brought the new metal sound into
New wave of American heavy metal of American heavy metal has its origins in a group of post-grunge acts from the 1990s that brought heavy metal "back to its core brutality" and drawing not from the traditional blues formula but from thrash metal and punk. In the book "The Next Generation of Rock & Punk", Joel McIver acknowledged Korn as the pioneers of the new wave of American heavy metal, and also credits them as the first band labeled as nu metal. The nu metal genre was popular in the late 1990s and early 2000s. Other roots of NWOAHM are attributed to bands such as Pantera,