Patti LuPone visits Stephen Colbert then belts out “The Ladies Who Lunch” from “Company”

Patti LuPone returns to The Late Show for a fascinating conversation that centers around her friend and mentor, the late Stephen Sondheim, who she lovingly describes as a “taskmaster” in rehearsals. Stick around to watch Patti perform a number from Sondheim’s musical, Company (below).