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Three countertenors have been cast, including as Julius Caesar, a vocally demanding role often given to a mezzo-soprano.

Both that darkness and light are embraced in the choreographer Mark Morris’s 2007 production, which is being revived at the Metropolitan Opera starring the countertenor Anthony Roth Costanzo.

Anthony Roth Costanzo was hired Thursday as general director and president of Opera Philadelphia and will continue his career as a leading countertenor while taking over an ambitious company dealing with post-pandemic economic challenges.

Anthony Roth Costanzo, the celebrated American countertenor who is one of opera’s biggest stars, will lead Opera Philadelphia as its next general director and president, the company announced on Thursday.

Thirty minutes long, and scored for a big orchestra, countertenor soloist, children’s choir, broad battery of percussion, electric guitar and pair of synthesizers, “Hippogriff” is not so easily dismissed.