You know how when you're working on a song, you often lose touch with how a fresh, outside person hears it, and thus can't tell if you're doing something wrong? Is there some trick you can use to hear your song from a fresh perspective? (not counting just putting it aside for a week, which isn't very productive.) I know that in digital art, if you reverse your image horizontally, you can suddenly see it anew, and immediately spot your mistakes. Does music have such a trick?
(If not, someone should develop one. I'm SURE there's a way.)
Thanks.