I most certainly listen to a bunch of music when writing. Usually it's random select, sometimes it'd be a specific album or playlist.
I do have thoughts like that with movies or etc too. Such as with the last movie I saw (the LEGO movie), one part towards the end I felt would have been better removed, really.
And rewriting... I'd been doing a bunch of edits of my first fic of late (the final ones, haha), but it's less rewrite and just light edits - better wording, maybe an extra sentence, catching last typos but I'm mostly content with the events. (And after all, it's a parody, many of the events already exist anyway in a set order, haha).
But a fic I'm just about finishing off bar MORE EDITING has gone through a bunch of rewrites. The final product has... a bunch more themes and ideas than I initially had, some changes to how/why events happened, a change to a major plot idea, etc. And really I could probably run away and add so much more too, but I figure that'd just take away all too much from the main idea I wanted to write about in the first place. >_>