Oh also, just as a note, you don't have to get as close to 20 minutes as possible to maximize your score, it's just the maximum time limit. I'm essentially going to be scoring submissions as weighted averages of the individual songs (I don't literally get that granular with it, but that's the basic idea), so if you have a submission that's 10 minutes of really killer music, it'll score better than one with 15 minutes of killer music and 5 minutes of dreck. The temptation is always to cram in as much as possible, which I understand, but just be aware that you don't need to, and in some cases it may be smarter not to.