The genre is generally considered a fusion between alternative rock and heavy metal,[6] although AllMusic states "alt-metal is a far-reaching term that has been used to describe everyone from Hammerlock to Neurosis to Ministry to Limp Bizkit".
[10] They also remarked that alternative metal was originally "a style united by its nonconformist sensibility rather than any immediately classifiable sound.
"[5] One of the main characteristics of alternative metal and its subgenres are heavily downtuned, mid-paced "chug"-like guitar riffs.
[18][19] Jonathan Gold of the Los Angeles Times wrote in 1990 "Just as rock has an alternative, [left] wing-bands like the Replacements and Dinosaur Jr.-so does metal.
[5][22][23][24][25][26][27] These bands never formed a distinct movement or scene; rather they were bound by their incorporation of traditional metal influences and openness to experimentation.
[34] Bands such as Faith No More, Jane's Addiction and Soundgarden are recognized as some of the earliest alternative metal acts, with all three of these bands emerging around the same time, and setting the template for the genre by mixing heavy metal music with a variety of different genres in the mid to late 1980s.
This was only possible in a climate where record labels, journalists, and college radio DJs understood that the metal audience could embrace new, albeit arty variations on the form.
"[42] The alternative music festival Lollapalooza conceived by Jane's Addiction singer Perry Farrell, helped bands associated with the movement such as Tool, Rage Against the Machine, Primus, Nine Inch Nails, Soundgarden, and Alice in Chains gain exposure.
[4] Spin stated in August 1998 that "It was Helmet that spawned the idea of alternative metal with the punk crutch of 1992's Meantime [and] bands such as Rage Against the Machine took the concept a crucial step further, integrating hip hop to connect with skate rat kids raised on Metallica and Run D.M.C.
[5] Life of Agony's debut album River Runs Red combined alternative metal with influences of hardcore punk, with lyrics about depression and suicide.
[52] During the late 1990s and early 2000s, nu metal was prevalent in the mainstream, with bands such as Korn, Limp Bizkit, Linkin Park, Slipknot and Staind all attaining success.
"[5] Some nu metal bands managed to push musical boundaries while still remaining commercially viable, such as Mudvayne (who combined progressive[53] elements) and Deftones, who have incorporated post-hardcore and dream pop influences.
[57] Korn and Limp Bizkit were frequently featured on MTV, often hitting number 1 and having multiple retired videos on the popular MTV show Total Request Live, competing on the show with boy bands like N'Sync and Backstreet Boys.
But the brief, nebulous era of alternative metal in the late 80s and early 90s remains a snapshot of a vibrant time when a brash new generation of heavy-leaning bands threw everything against the wall to see what stuck.