Depends on my mood. I try to keep my world open to artists outside of the US as well. I am from the US and when you have lived in the US for a while, you come to notice that Americans do not listen to music of other countries like Europeans or Asians would. It is interesting. I like all kind of genres, from pop and R&B to classical music and oldies.
If I was to choose from those it would have to be Rock. But otherwise I love Indie and Electronic Music like M83.