That 60 Minutes segment was a tear jerker. How absolutely incredible it is that he might not know where he is or what's going on, but as soon as the music starts, he is fully engaged. It was amazing seeing that clip of him backstage before the Radio City Music Hall show, not totally aware of what was going on, followed by the clip of him on stage when the curtain rose, and he was totally on. Something clicks for him with music and performing and it's special to see...he still has such great stage presence and vocals despite everything. It was so sweet seeing him say "Lady Gaga!" when she walked on stage, and how it touched her.