Considering I write alot of sci-fi,fantasy, and horror and occasionally all three at once.
I usually listen to rock, or something like "The road to death is awe" by Clint Mansell when I write.
Tried romance, didnt work out to well. Atleast pure sappy "I love you but I have to go and can never see you again,but Ill magically come back in the sequel" it just dosent work.