Stephen asks if he can duet with Carly Simon on a song she once sang with James Taylor.

The Late Show,Stephen Colbert,CBS,Dave Letterman,The Colbert Report,Late Show,celebrity guests,celebrity interviews,celebrities,late night,late night talk show,talk show,skits,bit,monologue,The Late Late Show,late night show,david letterman show,david letterman,the ellen show,the tonight show,tonight show,sketches,comedian,impressions