Rave music got it start in Britain in the late 1980s, closely following the acid house phenomenon. Initially "rave music" was considered particular style that was a combination of fast breakbeat and more hardcore forms of techno. Early 1990s efforts by The Prodigy (The Experience), Utah Saints and The Shamen (En-Tact) were quintessential "rave music".
By the early 2000s, the term was used more generically to mean any one of a number of different styles (or combinations thereof) that might be played at a rave party. In this sense, rave music is more associated with an event than a particular genre, per se. At a rave there can be different "arenas" or areas which play different styles of rave music. Very large raves called massives, may include ten or more separate arenas, each with their own music style.
Raver styles of music continue to grow and evolve. Some genres and an iconic artist include (not an exhaustive list):