Punk rock emerged in the mid-1970s as a reaction against contemporary social conditions as well as what was perceived as the overindulgent, overproduced rock music of the time, including heavy metal. Sales of heavy metal records declined sharply in the late 1970s in the face of punk, disco, and more mainstream rock. With the major labels fixated on punk, many newer British heavy metal bands were inspired by the movement's aggressive, high-energy sound and lo-fi, do it yourself idea.
Motorhead was the first important band to try and mix the two genres of punk and metal, and with the explosion of punk in 1977, other bands followed.
British music papers such as the NME and Sounds took notice, with Sounds writer Geoff Barton christening the movement the "New Wave of British Heavy Metal". NWOBHM bands including Iron Maiden, Saxon, and Def Leppard reenergized the heavy metal genre. Following the lead set by Judas Priest and Motorhead, they toughened up the sound, reduced its blues elements, and emphasized increasingly fast tempos. In 1980, NWOBHM broke into the mainstream, as albums by Iron Maiden and Saxon, as well as Motorhead, reached the British top 10. Though less commercially successful, other NWOBHM bands such as Venom and Diamond Head would have a significant influence on metal's development. In 1981, Motorhead became the first of this new breed of metal bands to top the UK charts with No Sleep 'til Hammersmith.
