It's not singing as we know it. But it's not exactly a spoken piece either. The closest thing is similar to watching a train wreck in real time—horrifying and yet, completely fascinating at the same time. I am, of course, talking about William Shatner “covering” Bohemian Rhapsody [1] (and you can thank Bunny for that link). But I think I like his “covers” of Space Oddity [2] and it's sequel, Major Tom (Coming Home) [3] a little bit better.
[1] https://www.youtube.com/watch?v=rmPOWJtsEGc