Dustin Hoffman cut stars' aria from opera movie
Courtenay reveals the cast delivered a rendition of Verdi's Rigoletto for the film, but the footage ended up on the cutting-room floor as it wasn't their best work.
He tells the Daily Mail, "Dustin did a great job on the movie, but sadly he had to cut out our singing performance.
"We tried singing during filming, but when it came to what the public sees, we thought it was the best solution not to hear our quartet. The fact is some of us were better than others."
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