I thought this NY Times article about Jay-Z's song "D.O.A. (Death of Auto-Tune) was good. Might be able to use it when discussing changes in demand due to advertising or endorsements. It supports the belief that any publicity is good publicity. Auto-Tune is enjoying more and more popularity, with T-Pain (as mentioned in the song) leading the way. Not just in his one music but also in comedy stuff like "I'm On A Boat" and "Thug Story". The article points out that using Auto-Tune to distort vocals instead of improving them was pioneered by Cher's "Believe."
I hadn't seen the video for Jay-Z's song before...it's decent. I liked the cameo by Lebron James.