the score

John, who wrote the score for the stage adaptation, told the audience that he struggled to experience the West End show in its full glory because of his deteriorated vision.

Though he wrote the score for the musical, John told “Good Morning America” that he is unsure of whether or not he’ll be able to continue his music career if his infection should persist.

John, 77, appeared onstage after a charity performance of the musical “The Devil Wears Prada,” for which he wrote the score, at the Dominion Theatre.

John also wrote the score for “Tammy Faye,” which is set to close on Broadway this week after only 29 regular performances.

He has also written the score for some hits, including “Billy Elliot” and the long-running “The Lion King.”