Hi Kurz,
I would look for some of the more obvious things in the recordings. If it's a vocal tune, determine if the lead vocal is loud enough, not loud enough, too loud, etc. Also, a common mistake made with background vocals is that sometimes they're too up front, overshadowing the lead vocal. Important as well are the pan positions. Is the point of focus (lead vocal for example) centered properly? have the drum tracks been panned in such a way as to give the ear a sense of listening to a live drum kit...i.e. snare centered, hat slightly right of center, rack toms very slightly left of center, floor tom a little more left of center? Lastly, are the instruments in tune with one another? Are we sure that the guitarist doesn't have a slightly out of tune "b" string?
Just a few examples for you, and I hope they help you on Dec 11th.
Take care,
Charles

Only thing I have to say is that if you have been mixing for live shows, just approach the song in a way you'd be mixing the show. Is the bass drum and bass sitting well in the mix. Vocals are clear and upfront if needed in that style, etc.....You know how it works and if your good at mixing shows, there shouldn't be a problem. One more tip, listen to music 24/7. Good and bad cds. Take notes of what is good and what you would change. You'll developp an ear to critique a mix very easily this way. Good luck. :wink: