I wish I could listen to books or podcasts but I find I just can't do both as well as others. I'm either to focused on my art and don't really absorb anything being read/talked about. Or I get to distracted by it and focus less on my art.
So mostly just music, but it really depends on my mood what kind. But for the most part I would say it's usually something like soundtracks or instrumental music. I have found I actually like a lot of upbeat electronic music as well, it can have a very rhythmic upbeat style to it that can serve to drive me and energize me while creating.