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Crunk, a subgenre of hip hop, is characterized by its fast tempo, heavy bass, and aggressive lyrics. Lil Jon is widely credited as the pioneer of crunk, having popularized the style in the late 1990s and early 2000s with his group Lil Jon & The East Side Boyz. Crunk's influence can be heard in many contemporary hip hop and rap songs, making it a significant contribution to the genre's evolution.