| http://www.w3.org/ns/prov#value | - It is typified by a heavy use of aggressive vocals, distorted electric guitars, bass guitar, drums, and often accompanied with pianos and keyboards.Hard rock developed into a major form of popular music in the 1970s, with bands such as Led Zeppelin, The Who, Deep Purple, Aerosmith and AC/DC, and reached a commercial peak in the mid to late 1980s.
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