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In page Elsa Bernstein:

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Although Engelbert Humperdinck was dissatisfied with his first concert setting of Königskinder in 1897, an avant-garde melodrama that demanded an innovative "speak-singing" technique from its soloists (despite production challenges, it nevertheless enjoyed more than 120 performances across Europe), he persuaded Bernstein, in 1907, to authorize a traditional opera setting that debuted in German at the Metropolitan Opera in New York in December 1910. That version is still performed.[citation needed]