I'm mostly into metal, Folk, Power, and Symphonic being the main ones. Here's a wall of text for you, although I left a lot off of it.
Alestorm, Altaria, Amon Amarth, Amorphis, Avantasia, Battlelore, Blackguard, Blind Guardian, Dark Moor, Demons & Wizards, Edguy, Eluveitie, Elvenking, Ensiferum, Equilibrium, Evile, Falconer, Finntroll, Gamma Ray, Glittertind, Heidevolk, Insomnium, Kamelot, Korpiklaani, Leaves Eyes, Machine Head, Mastodon, Midnattsol, Mors Principium Est, Nevermore, Persuader, Rhapsody of Fire, Sabaton, Savage Circus, Scar Symmetry, Skyclad, Sonata Arctica, Spellblast, Stormwarrior, Stratovarius, Turisas, Tyr, Wintersun, Wolfchant, and Xandria.