query: Who was the first heavy metal band?
passage: Heavy metal music
In 1968, three of the genre's most famous pioneers, Led Zeppelin, Black Sabbath and Deep Purple were founded.[6] Though they came to attract wide audiences, they were often derided by critics. During the mid-1970s, Judas Priest helped spur the genre's evolution by discarding much of its blues influence;[7][8] Motörhead introduced a punk rock sensibility and an increasing emphasis on speed. Beginning in the late 1970s, bands in the new wave of British heavy metal such as Iron Maiden and Saxon followed in a similar vein. Before the end of the decade, heavy metal fans became known as "metalheads" or "headbangers".
passage: Heavy metal genres
Traditional heavy metal, also known as classic metal or often simply heavy metal, is the group of bands and artists who play a metal music style similar to the style heard before the genre evolved and splintered into many different styles and subgenres. It is characterized by mid-to-fast-tempo riffs, by thumping basslines, crunchy riffs, extended lead guitar solos, and clean, often high-pitched vocals and anthemic choruses. It is not generally categorized as a subgenre of metal, but the main genre of it. Examples include Black Sabbath, Deep Purple, Led Zeppelin, Judas Priest, Iron Maiden, and Dio.