While I can see why Ballad Of Youth would be hard to pull off live (even on the Stranger tour he did as a a duet with Crystal Taliefero, his backing singer), and stuff like Father Time too would be tough, but I agree with Jovifan that One Light doesn't seem a particularly challenging a song for Richie to take on. I wouldn't say it was anymore challenging than Stranger really, and he does that at almost every show...