Short answers, pulled from the story.
Rap metal is a fusion genre that combines hip hop with heavy metal, built on heavy guitar riffs, funk metal elements, rapped vocals, and sometimes turntables. Nu metal, also called nü-metal or aggro-metal, draws from rap metal but adds influences from alternative metal, funk, industrial, and groove metal, making it a broader category.
Anthrax is widely recognized as one of the genre's earliest pioneers, releasing the extended play I'm the Man in 1987, which fused hip hop with heavy metal. Anthrax guitarist Scott Ian has said he believes Rage Against the Machine actually invented the genre.
Chocolate Starfish and the Hot Dog Flavored Water sold over one million copies in the United States in its first week, with 400,000 of those sold on the first day alone. This broke the record for highest week-one sales of a rock album, a record previously held for seven years by Pearl Jam's Vs.
Devil Without a Cause was certified 11 times platinum by the RIAA on the 17th of April 2003. Nielsen SoundScan figures from 2013 place actual sales at 9.3 million copies.
Woodstock 1999 featured several major rap metal acts including Kid Rock, Limp Bizkit, and Rage Against the Machine, and was marked by violence, looting, and fires. The event accelerated mainstream criticism of the genre, with commentators pointing to the festival as evidence of something troubling in rap metal's cultural atmosphere.
Trap metal is a subgenre of trap music that incorporates elements from metal and hardcore punk, characterized by distorted beats, hip hop flows, and harsh vocals. Bones is recognized by Kerrang! as one of the earliest practitioners, and British rapper Scarlxrd is widely considered a pioneer of the genre.