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apart from dennis o'neill , who was a doctor's son from pontarddulais , almost all these people were working-class kids who became world famous opera singers
ar wahân i dennis o'neill , a oedd yn fab i feddyg o bontarddulais , yr oedd bron pob un o'r bobl hyn yn blant dosbarth gweithiol a ddaeth yn gantorion opera byd-enwog