<P> Orpheus sang his grief with his lyre and managed to move everything living or not in the world; both humans and gods were deeply touched by his sorrow and grief . </P> <P> Apollo then advised his son to descend to Hades and see his wife . Any other mortal would have died, but Orpheus, protected by the gods, went to Hades and arrived at the infamous Stygian realm, passing by ghosts and souls of people unknown . He also managed to charm Cerberus, the monster known to have three heads . Orpheus presented himself in front of the god of the Underworld Hades (Pluto) and his wife Persephone . </P> <P> Orpheus played his lyre, melting even Hades' cold heart . Hades told Orpheus that he could take Eurydice with him but under one condition; Eurydice would follow him while walking out to the light from the caves of the Underworld, but he should not look at her before coming out to the light because he would lose her forever and ever . If Orpheus was patient enough he would have Eurydice as a normal woman again by his side . </P> <P> Orpheus was delighted; he thanked the gods and left to ascend to the world . Orpheus thought It was a simple task as he considered himself a patient man . He was trying to hear Eurydice's steps, but he could not hear anything and he started believing that the gods had fooled him . Of course Eurydice was behind him, but as a shadow, waiting to come to light to become a full woman again . Only a few feet away from the exit, Orpheus lost his faith and turned to see; Eurydice was behind him, but her shadow was whisked back among the dead . Eurydice was gone forever . </P>

Why does hades at first agree to return eurydice to orpheus
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