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In page Thrash metal:

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As further extreme metal genres came to prominence in the 1990s (industrial metal, death metal, and black metal each finding their own fanbase), the heavy metal "family tree" soon found itself blending aesthetics and styles.[38] For example, bands with all the musical traits of thrash metal began using death growls, a vocal style borrowed from death metal, while black metal bands often utilized the airy feel of synthesizers, popularized in industrial metal. Today the placing of bands within distinct sub-genres remains a source of contention for heavy metal fans, however, little debate resides over the fact that thrash metal is the sole proprietor of its respective spin-offs.[citation needed]