What does Peter see in his first vision?

In his first vision, Peter sees a group of boys chanting near a hut. There, a blind man sits with a beautiful woman named Cardiwen. The blind man announces that one of the boys would be chosen to follow the Bard, Aneirin. The beautiful woman walks along the row of boys, resting her hands briefly on each of their heads, before selecting one boy, whom she renames Taliesin, as the chosen one.