by DrRapid » Jul 29th, '07, 10:25
I've read in wikipedia even that for some of you seem to think it's not to be trusted that there's the:
Old School Hip Hop describes the some of earliest hip hop music to come out of the block parties of New York City in the late 1970s and early 1980s. It is preceded by the Roots of hip hop from the early 1970s to the late 1970s, hip-hop formative period.
Gangsta Rap is a subgenre of hip hop, which developed during the late 1980s. After the popularity of Dr. Dre's The Chronic in 1992, gangsta rap became the most commercially lucrative subgenre of hip-hop. Since then some former gangsta rap artists have moved towards a more pop-friendly mainstream sound.
G-funk, or "Gangsta Funk", is a type of hip hop music that emerged from West Coast gangsta rap in the early 1990s. G-funk (largely derived from slowing the tempo down of funk music) incorporates multi-layered and melodic synthesizers, slow hypnotic grooves, a deep bass, background female vocals, the extensive sampling of p-funk tunes, and a high portamento sine wave keyboard lead—a feature that became the genre’s notable trademark. Additionally, unlike other rap acts at the time (such as EPMD or The Bomb Squad) that sampled heavily, G-funk often utilized only one or two samples per song.
Hardcore hip hop is a form of hip hop music characterized by confrontation and aggression in its subject matter, heavy beats, raw sampling and production, or any combination thereof. The term can refer to similar musical sensibilities that encompass several related genres, including gangsta rap, Mafioso rap, Horrorcore, rapcore, political hip hop, and alternative rap.
There's even more but it doesn't seem to explain in some of them.

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