If you don't know what Autotune is.... It's an (in) famous piece of equipment which can correct an out of tune voice on the fly, live.
Many professional singers are accused of RELYING in Autotune to sound good. Apparently Autotune is also used in competitions like American Idol & X Factor.
This video is by Ken Tamplin. I eagerly follow his channel because firstly he is a good singer, second has a really good commentary on the music & rock/metal industry.
He swears that some of these singers ARE using Autotune! Lol