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In page Folk Songs (Berio):

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The Folk Songs cycle was commissioned by Mills College in California and first performed there by a chamber orchestra directed by Berio in 1964 with Berberian as the soprano soloist. By the time of its first performance, the Berberian–Berio marriage was nearing its end, but their artistic partnership continued; they subsequently collaborated on works such as Sequenza III, Visage and Recital I (for Cathy). Berio had an emotional attachment to folk song: he once declared that "When I work with that music I am always caught by the thrill of discovery." Other later compositions by Berio that incorporated folk songs were Cries of London, Coro and Voci: Folk Songs II.[1]