I think that since we are talking about art here, there are really no boundaries that define what kind of instruments are used on specific genres. You can have a spanish guitar playing over an amen break, at 174 bpm and call it "liquid drum and bass", and you can also have half-step drums played at 174bpm and call it drumstep.
Give a check on wikipedia, inside each genre you want to know about. Normally you'll have some examples, and you can start building your knowledge from there.