British funnyman Sacha Baron Cohen's singing has reportedly been cut from Tim Burton's forthcoming SWEENEY TODD movie, because it's so bad. The BORAT and ALI G creator plays SIGNOR ADOLFO PIRELLI - the arch-rival of Johnny Depp's SWEENEY TODD, The Demon Barber Of Fleet Street - in the big screen version of the hit musical. British newspaper The Sun reports Burton has given Cohen permission to rap his songs, because his singing voice isn't good enough. A film insider says, "Pirelli is a notoriously demanding role with some difficult songs. "Any professional singer would struggle. So Sacha has been told to go for a rap style. It will be a bit like Jim Broadbent's performance in Moulin Rouge!. That won him a BAFTA. "Sacha is going to do a fantastic job but he couldn't cut it with the singing. His voice was too low."