Multiple women came forward to allege that, beginning in the 1980s, Domingo pressured them into sexual relationships by dangling jobs and, in some cases, punished them professionally when they refused his advances.
Nearly all of the women's accounts followed a similar pattern that saw the singer, married since 1962, begin their working relationship by telling them he wanted to help advance their careers thanks to his impressive network of connections.
Now eight singers and one dancer have told the Associated Press they were sexually harassed by Domingo.
The accusers' stories lay out strikingly similar patterns of behaviour that included Domingo persistently contacting them - often calling them repeatedly at home late at night - expressing interest in their careers and urging them to meet him privately under the guise of offering professional advice. The news agency said it also had spoken to nearly three dozen other musicians, voice teachers and backstage staff who said they had witnessed what the report described as "sexually tinged" behavior by Domingo dating back three decades in various cities.
And on Tuesday, the Philadelphia Orchestra withdrew an invitation for Domingo to perform at its season-opening concert next month.
Domingo did not respond to detailed questions about specific incidents, but issued a statement saying: "The allegations from these unnamed individuals dating back as many as 30 years are deeply troubling, and as presented, inaccurate".
"However, I recognise that the rules and standards by which we are - and should be - measured against today are very different than they were in the past", it added. "He was touching my knee", she said, adding that they drove to his apartment near the opera's Dorothy Chandler Pavilion, where champagne was waiting.More news: The Official Trailer for Greta Gerwig's "Little Women" Is Here
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The LA Opera said it would hire outside counsel to investigate the "concerning allegations" against Domingo. It was promoted as a "special one performance-only event" with "one of the most influential singing actors in the history of opera" and was one of several gala events this year to celebrate his legendary career.
Domingo was named Chairman of IFPI in July 2011, when it was announced that he would "play a leading role promoting IFPI's priorities internationally".
Yes, yes. So, she was not the target of him herself, but she said that it was, you know, well-known.
The woman said that over the next three years, he became "uncomfortably affectionate", and would touch her waist, kiss her cheek close to her mouth, and enter her dressing room uninvited. Wulf sang with Domingo at the Washington National Opera, where he was the artistic director until 2011.
"I was totally intimidated and felt like saying no to him would be saying no to God".
She is the only one of the alleged victims who agreed to reveal her identity.
Another half a dozen women said Domingo made overtures that made them feel uncomfortable, including insistent phone calls to ask them out on dates. One said Domingo had put his hand down her skirt while three said he had forcibly kissed them.