Major recording artists only, please.
Let's start with Dylan, then we can move on to Paul McCartney. His post Beatles recording make you yearn for Ringo, and I never thought that would happen..
We could then venture into our board favorite KISS and listen to "Beth". That is a GREAT song with Terrible singing, although it's obviously not the lead singer performing it.
Jerry Garcia. Died long before anybody knew he did.
Roger Waters. And Pink Floyd is one of my favorites.
Brian Johnson, although his pre AC/DC stuff is great if you can get it. The bands called Geordie, or something like that.
And I'm not sure about Ozzie, since he always uses that double-voice echo thingy.
I know my list is incomplete.