Heavy metal is a form of rock music that grew in the late 1960s and early 1970s, mostly in the United Kingdom and the United States. With origins in psychedelic rock and blues rock, the bands that produced heavy metal advanced a thick, massive sound, characterized by greatly amplified distortion, emphatic beats, extended guitar solos, and overall loudness. Heavy metal performance and lyrics versions are frequently connected with masculinity, machismo and aggression.
The initial heavy metal bands like Led Zeppelin, Deep Purple and Black Sabbath appealed to large audiences, though they were frequently derided by detractors, a status ordinary all through the history of the version. During the mid-1970s, Judas Priest aided spur the genre's development by getting rid of much of its blues impact; Motörhead instituted a punk rock sensibility and a gradual emphasis on speed. Starting in the late 1970s, bands in the New Wave of British Heavy Metal like Iron Maiden and Saxon followed in the same vein. Before the end of the decade, heavy metal supporters became referred to as "headbangers" or "metalheads".