The style known as trip-hop has its roots in everything from funk to old hip-hop to acid jazz, the neo-funk movement that sprouted up in London circa 1988.
It can be made entirely with computers and electronic devices, like Mr. Scruff. It can be played by a band, like Red Snapper. It can be a mix of both, like Jazzanova. It can even be instrumental hip-hop, or what would be considered instrumental hip-hop if it had come out of the hip-hop scene.
This is perfectly blended hip-hop, soul, vocals, atmospherics, and brilliant production into a cohesive whole that initially defied categorization. This is world of Massive Attack, Tricky, Portishead and much more.