McKellen joked with Vulture, saying, "I have written my own song, but it didn't make it in."
Bill Condon, director of the film, said, "He is completely, innately musical, which I suspected he would be, just having heard him recite Shakespeare. We did a read through of the show a month before we started shooting the script. And he came in, he just killed every line. It was like you're in the presence of someone who's done stand-up for 20 years."
The film is set to be released in theatres March 17, 2017.