There are many books in which chapters and/or segments begin with quotes from outside sources. You can see it in nonfiction as well as in fiction. Usually it's some quote by Shakespeare or Rumsfeld, or someone who will not otherwise sue you. Is it okay to use the lyrics of, say, a comtemporary song in the beginning of a chapter, while fully crediting it? To me, it feels like fair use (I recently began reading a fictional book that begins even with a quote from another nonfictionbook, crediting the author). So, if I quote 3 lines from Foo Fighters or Garbage, to get people into the right mood, is that okay?