Jonathan Groff is currently hunting serial killers in Netflix's Mindhunter, but that doesn't mean he has to leave his musical theater roots behind.

In a new video interview with USA Today, Groff sits down with his Mindhunter co-star, Holt McCallany, and talked about life on the set of the David Fincher series—including how Groff could not stop singing on set.

"They [his co-stars] were like shut the f*ck up," Groff jokes in the clip. In addition to singing during filming, Groff and McCallany reveal that they sang a duet at the memorial for McCallany's mother.

Based on the true crime novel, Mind Hunter: Inside the FBI’s Elite Serial Crime Unit by John Douglas and Mark Olshaker, the book follows Special Agent Douglas as he profiles some of the country’s most infamous serial killers including Charles Manson and Ted Bundy.

Groff’s character is based on Douglas and depicts his career profiling serial killers in the 1970s.

Mindhunter debuts this Friday on Netflix. The series has received rave reviews, and has already been renewed for a second season. Maybe Season Two could include a musical episode?