Since his debut, he has been using auto-tune (“a vital VST” for most of the singers nowadays). Even though, he was sounding good. But, for the last few months, he's been continuously releasing songs for T-Series. Now, I don't know whether it's due to this or something else, his voice quality is declining day-by-day. He has used loads of auto-tune in his songs be it Downtown or Tere Te. Also, he is performing across the whole world almost, every day.