TAC has outed himself in the same day as not reading the rules in either mine or Luke's.
I haven't really hammered down exactly what they are yet, particularly since it'll be at the very end of the roulette, probably a couple months away at minimum. Standard procedure for other roulettes seems to be at least three different artists, and with mine being 45 rather than the 30 or 40 for some, I might make that at least four different artists, I'll have to ponder it more. I'm thinking that no artist should dominate more than a third of the runtime, something like that. You can start thinking about it now for sure, but I'd definitely advise not putting too much effort into it this early unless that's just really fun for you, since you're probably going to figure out a lot more about my taste in the upcoming rounds, and get confused about even more of it.
For unrated albums, it really depends on the particular one, it could easily be either. Just PM me if you're really curious about one or two in particular.