Figured I should post here as well with a long winded post
It's that or continue studying.
Old rock - Eg The Beatles, The Rolling Stones, Pink Floyd, Led Zeppelin etc - Bands I really enjoy listening to the lyrics are more than the same few words constantly repeated - Occasionally you get a gem like Lynard Skynard and The Eagles who seemed to make driving music.
Classical music - Great for ambience when you're working on getting a task done or studying, has so much energy behind it it keeps you going while at the same time you don't really listen to it when doing a task but it keeps you focused. I also listen to classical when I go for a run, just keeps you going, let's you think about other things going on.
Dubstep - Oddly I enjoy it for a similar reason to classical, good for studying. Occasionally I snap out of my daze and think, "What the **** is this scratched techno rubbish", then it fades and I get back in the zone. Also good for clubbing and nights out.
House - Great party music/Weekend music, doesn't need you to listen to it just to follow the beat in the background. Many many good nights at clubs that play house music.
Country - Pretty much written for road trips and chilled weekends in the middle of nowhere. Stories to listen to when you just are in a zone to be chilled.
Heavy rock/Metal - Just for those times when I want to listen to something heavier there is music I have for it, but it usually doesn't last that long anymore.