Yo-Yo Ma sits in with the band and provides musical accompaniment. Whole Foods Apologies. Senator John McCain discusses recent politics. Stephen Colbert's Who Am Me? (Stephen takes a polygraph test). Misty Copeland discusses her new documentary, ‘A Ballerina's Tale’. Copeland also performs the courante from Johann Sebastian Bach's "Cello Suite No. 2" with Ma. The Late Show celebrates Ma's 60th birthday.