In November 1953, the Nationaltheater in Mannheim, Germany, staged a new opera, the composer Boris Blacher’s “Abstrakte Oper Nr. 1,” which had debuted just months previously. As it ran, music fans were treated to both a performance and a raging controversy about the work, which one critic called “a monstrosity of musical progress,” and another termed “a stillbirth.”
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Source: Phys.org