Do what?
They haven't used a producer before "Dirty"? I think I read that wrong, since they had a producer on almost all their stuff.
Second: Do YOU know what "production" means? Not only does "Dirty" have a filter of fucking gloss over the whole thing (it sounds like a shiny diamond and enters my ears like sticky bubblegum), let's not forget the whole "drum sample" controversy that was mixed into the album (you know, how there are sampled drums on top of some of the other drums to give the drums more "oomph")?
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