To Mozart? I think Tony Ann fits that bill. He's not super well known yet, but he's on his way there.

ZUN.

Alpine Universe is pretty damn good, I thought it was a band until I looked them up on Instagram and found out it was one dude that multi-tracks his voice and plays multiple instruments. I watched a few of his production videos and was amazed.

Maybe someone like John Oliva

Everyone, if everyone could live the lives they want to without starving.

The fact that Miles Davis or Duke Ellington haven't shown up yet makes me question the musical diversity of Lemmy.

Freddy Mercury and David Bowie are up there in that podium.

Louis Cole has a great understanding of music structure and plays around with it very well

Well, Mozart was a composer, so I don't know what parallels you're drawing from to compare hin to Weird Al or Surfan [sic] Stevens. If we're talking strictly in terms of best living musicians, Joanna Newsom is probably the best songwriter of the past fifty years, and in my opinion, the second place isn't even close.

Jack Antonoff has some incredible talent. He's written and produced a lot of iconic pop music.

Incredible Polo

Justin Timberlake has dropped hit after hit for almost 30 years and hasn't had any real controversies along the way.

No planet on which Sufjan Stevens is a Mozart.

Uncontroversial:

Radiohead

David Bowie

Daft punk

Controversial:

Kanye

Terrible person, but then again that wasn't the question.