By Rex Hammock

Content marketing can often seem like new labels applied to old ideas. In a broad way, it can even mean Broadway. At least, that’s what you may think after watching the Netflix documentary ”Bathtubs Over Broadway.”

Steve Young, a former writer for the “Late Show with David Letterman,” was the subject of the documentary directed by Dava Whisenant and co-written by Dava and Ozzy Inguanzo. The documentary is both funny and fascinating in its exploration of the heyday of industrial musicals.