The only untouchable song for me is "What's Going On" because I remember the era that led to it and it still touches on raw nerves. With that being said, it is just as relevant today with the terrorist threat, police brutality and the Black Lives Matter movement, students protesting against university administrations, everything that I heard in the Republican debates, and the myriad civil wars and attempts at genocide occurring in several countries. I just don't think any artist could improve on the song and it would come across as flat unless it was something truly special.