Fe w singers today can boast a career to match Christa Ludwig. Although she retired in 1994 – these days “I don’t even sing with my dog,” she jokes – the great German mezzo who celebrated her 90th birthday on March 16 is still actively involved in masterclasses and has been happily giving opinion-filled anniversary interviews.

Christa Ludwig at 90

Born in 1928 into a musical family in...

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