Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Avant-garde metal, also known as experimental metal, is a subgenre of heavy metal music characterised by the use of innovative, avant-garde elements, large-scale experimentation, and the use of non-standard sounds, instruments, and song structures. The term avant-garde metal refers to bands and musicians who "incorporate new and innovative elements in metal, who break conventions, tear down walls, violate borders." The genre has also been described as "the art of creating deep and strange atmospheres by experimenting with new instruments and sounds, strange vocals, unconventional song structures, rhythms and harmonies, unusual lyrics or uncommon artwork" or alternatively, "progressive, psychedelic, surrealistic, phantasmagoric, expressionistic, dissonant or extravagant interpretations of extreme metal."

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