In December, R.E.M.'s Michael Stipe joined Stephen Colbert to reluctantly ring out 2016 with a list of terrible things that happened last year, while still feeling fine. On Wednesday's Late Show, it was Paul Simon's turn for a duet on the emotional duality of these times we live in. Colbert asked Simon whey he didn't play "59th Street Bridge Song (Feelin' Groovy)" anymore.