My answer: George Michael
While I am sure that he would insist that he never left, I would posit that his potent, velvety-smooth voice has been missing from the top-of-the-pops scene for far too long. The man has one of the most versatile and beautiful voices ever recorded; he needs to be heard---NOW!
on Listen Without Prejudice, Volume I. The somber lead single, "Praying for Time," took a distraught look at the world's festering wounds (and is still astonishingly relevant to our society now, in 2012). In "Freedom 90," which combines dance beats with soaringly vital gospel choruses, George shared confessional secrets with his audience and challenged us to rise above. He wised-up enough to admit that, in the past, "it was enough for me, to win the race, a prettier face, brand new clothes and a big fat place, on your rock and roll TV." But he was endeavoring to leave the apparently embarrassing butt-shaking Faith era behind: "Posing for another picture, everybody's got to sell, but when you shake your ***, they notice fast, and some mistakes were built to last." This is a far cry from the man who unabashedly titled a Wham! album Make It Big. Here was a singer who wanted to be taken seriously as an artist.
This is an artist whose songs have been covered by everyone from Rufus Wainwright and Ben Folds to Limp Bizkit. He's sold 100 million records. George, wake up and smell the coffee! Your silver-tongued voice is still needed!
I propose an album of standards (yes, I know you did something like that awhile back with Songs from the Last Century, but you have to admit your choice of material on that one was quirky to say the least). Take on the Great American Songbook: try some Gershwin, have a go at Cole Porter, croon a Rodgers and Hart tune! If croaker Rod Stewart can do it, you can-- and better!