Def Leppard hysteria is great for details. There are just hundreds of tracks in the vocals and guitars because mutt lange.

Some of the most layered production I've ever heard. I imagine other mutt lange stuff could also be beneficial, but that album in particular is just kind of a magnum opus in production value.

I also enjoy rush, dire straits.

And some avant-gard stuff like Mike Patton or Mr. Bungle where there's a lot of genre changing.