A planned concert presentation of Bizet’s “Carmen” at Royal Albert Hall, featuring Joyce DiDonato, has been canceled due to the health of conductor John Nelson.

While the nature of Nelson’s health condition has not been disclosed, his doctors have advised him to rest for several weeks before returning to the podium.

According to an official press release, the scheduled performances of “Carmen” in Strasbourg, Apr. 4 and 6, with Michael Spyres and Elena Maximova, are still on the books. Aziz Shokhakimov, music director of Orchestre Philharmonique de Strasbourg, will conduct.