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In page United Nations:

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Thant first approached Casals, who was a personal friend, looking to create a hymn to peace and hoping for the song to be based on the preamble of the Charter of the United Nations. Thant later commissioned Auden to write the poem after Casals requested one to set to music.[citation needed]Auden completed his work in three days time. The finished work, scored for chorus and orchestra, takes approximately seven minutes to play. However, there were never any plans to adopt the song as the organization's official anthem.