Thanks for the welcomes guys. Alrighty Trance? I don't exactly know the way to define it but some good artists to describe it would be ; Ian Van Dahl, Dj Tiesto, Safri Duo, William Orbit, Armin Van Buuren, Markus Schulz.
And in the Metal/Hardcore genre, I mostly listen to Sevendust, Ill Nino, In Flames, Killswitch Engage, Soilwork, Roadrunner United, Mudvayne, Static X, Demon Hunter, Lacuna Coil, Flaw, Evanescence, Within Temptation, Puscifier, Slipknot (Somewhat). There's more but I should probably stop there.
Pop/Rock/Alternative? I guess some aren't Pop/Rock but I'll mention them anyway ; Alkaline Trio, Bodyjar, Killing Heidi, Sum 41, Antiskeptic, Anberlin, Jimmie Eat World, Five For Fighting, Oasis, No Doubt.
And hiphop? Basically anything with a good beat, Good lyrics and not your clique gangsta'-wars.