From Wikipedia definition:
"Trip hop (also known as the Bristol sound) is a term coined by United Kingdom dance magazine Mixmag, to describe a musical trend in the mid-1990s; trip hop is downtempo electronic music that grew out of England's hip hop and house scenes. Characterized by a reliance on breakbeats and a sample-heavy sound...trip hop gained notice via popular artists such as Portishead, Massive Attack, Tricky, and rock-influenced sound groups such as Ruby, "
