Musical Theatre

The Gilded Age (or Downton Abbey: New York as I call it) is a fun show, partly on its own merits (it's a high-class "old money versus new money" soap opera set in the 1880s), and partly because it features a long, long list of musical theatre (and straight theatre) performers in its sizeable ensemble, as this BroadwayWorld article goes on to list. Among the well known (and lesser known) actors in the series are Christine Baranski, Audra McDonald, Denee Benton, Laura Benanti, Donna Murphy, Kelli O'Hara, Patrick Page, Nathan Lane, Celia Keenan-Bolger, Michael Cerveris, Douglas Sills, Claybourne Elder, Robert Sean Leonard, Debra Monk, Taylor Richardson, Ashlie Atkinson, Kristine Nielsen, William Ryall, John Douglas Thompson, Jeremy Shamos, Tony Carlin, John Behlmann, Dakin Matthews, Michael Halling, Fergie L Philippe, Darren Goldstein, Josh Davis, Todd A Horman, Samantha Sturm, Brittany Bradford, Audra Bennett, Michael Di Liberto, Fred Inkley and Adam Monley.

Julian Fellowes, creator and writer of The Gilded Age (and Downton Abbey) has also dabbled in musical theatre, with the book for the stage adaptation of Mary Poppins to his credit (which, you know, you can see how that might happen), as well as - more improbably - the book for the School of Rock musical, adapted from the Jack Black film (which, how the hell?).