See Stephen Colbert's Epic, Star-Studded Farewell Sing-Along

When it was announced that Grimmy the Grim Reaper would be Stephen Colbert’s final guest on The Colbert Report, fans speculated whether the future Late Show host was killing off his satirical character. Instead, Colbert’s Colbert became immortal, and he closed out his nine-year Comedy Central run with a performance……

Source: RollingStone
Link: See Stephen Colbert's Epic, Star-Studded Farewell Sing-Along