Pandora's Scar is a present day Fantasy story with a manga-esque art style, but something about anime soundtracks really throws me off when I'm working on it. I prefer something which can blend into the background. Soft rock is a favorite, but other choices can range from country music to Italian opera depending on my mood. Regardless of genre, music is a must- it helps me keep track of time passing so I don't get 'stuck' both mentally and physically.
I've also developed a liking for Youtube play lists. I start with something I know and like, and just let the list play on. It turns out nice surprises- sometimes I may be in the mood for soft tunes, but running into a fast and energetic number helps keep me on my toes. And if there's anything I really don't like, I can just skip to the next appropriate tune in the list.
Also, as a rule, I listen to music/instrumental only tracks when I am writing plot or dialogue- anything involving text. But when I am working on my artwork, I like to have lyrics : )