Apparently he doesn't actually sing on this, and that it's just the beat from his song "Rock With You" that is the basis of "Stop Playing."
What I'm scared of is that MJ can't really perform any more. I mean, a plastic-surgeried-out 50 YO guy, frail, constantly hiding from the press... he's been through a lot of ****. One of his people has also said that we won't see him perform "ever again."

Hope it's not true. I'd love to see a Michael + Janet performance.