Indie Pop, Electro Indie, Jazz and Blues Rock is very inspiring to me. I specifically listen to these genres when I'm making sigs or drawing. Classical music stabilizes my mind; my thinking, so before I study, I listen to that and drink tea (I also drink tea while studying/doing homework). It's like a ritual lol :p I listen to OST's when I'm upset. And I listen to Spanish romantic music when I'm well... you know, thinking about my love *blush*.
Everything else like hard rock, classic rock, oldies, blues, jazz, disco, alternative, experimental etc. I listen to regularly.