>>126742484>>126739866It's pretty obvious, unless you're not familiar with autotune.
Pick any song where he holds a note for a long time, like the chorus on Bleeding Me, you'll notice these pitch corrections that sound unnatural.
You can also compare the vocal performance with Cunning Stunts to make it even ore obvious.
https://www.youtube.com/watch?v=OdGyqRgf73Y