You're going to do better as a planner if you're interested in, and understand, what drives creative people. So here's an interview with a very good one - graphic designer and illustrator Stefan Bucher of 344 Design. (He is 344 Design.) We worked together briefly thousands of years ago and haven't met up for ages - so it was very decent of him to agree to an off the cuff interview.
You can see a lot of Stefan's beautiful work at his site and you can see some of the CD covers and books he's designed here. Top of the list is his amazing book - Access All Areas which I've raved about before but which you should get. Also look at this lovely graphic/column he does for STEP magazine.
Stefan talks wisely about briefing, 'greed-control', the problems of advertising agencies and the scientific study of Donald Duck comics.
It's about 11 minutes. Apologies for all the quality issues you may have, as per usual. For some reason it seems to be in mono.
stefan.m4v. Videopod version (About 60MB)
stefan.mov. Quicktime. (About 18MB)