It was just really cool. I was shooting it with Darren Criss, so in between takes, we’d all just be sitting there. (Darren and I) were just chatting his ear off and he was basically forced to talk to us because he was stuck on stage with us. It was this forced, impromptu one-on-one. But he was chill. He’s a pretty humble guy.
Jeremy Jordan on meeting Stephen Sondheim while filming “Six By Sondheim”. (Source)