You now have a week to finalise the track that you are going to use and submit to CF/KJ for approval. The sooner you do this, the better. That way you can get cracking with relevant product analysis and planning.
Remember - choose something that is appropriate to produce a low budget video for - stadium rock for example might be a bit tricky to do... It doesn't necessarily need to be to all of your tastes either - you'll end up loathing the track after editing anyway!