TOLKIEN HAD THE WORDS FOR IT: 9 SMITH OF WOOTTON MAJOR

The Feast had been in mid-winter, but it was now June, and the night was hardly dark at all. The boy got up before dawn, for he did not wish to sleep: it was his tenth birthday. He looked out of the window, and the world seemed quiet and expectant. A little breeze, cool and fragrant, stirred the waking trees. Then the dawn came, and far away he heard the dawn-song of the birds beginning, growing as it came towards him, until it rushed over him, filling all the land round the house, and passed on like a wave of music into the West, as the sun rose above the rim of the world.
"It reminds me of Faery," he heard himself say; "but in Faery the people sing too." Then he began to sing, high and clear, in strange words that he seemed to know by heart; and in that moment the star fell out of his mouth and he caught it on his open hand. It was bright silver now, glistening in the sunlight; but it quivered and rose a little, as if it was about to fly away. Without thinking he clapped his hand to his head, and there the star stayed in the middle of his forehead, and he wore it for many years.
Few people in the village noticed it though it was not invisible to attentive eyes; but it became part of his face, and it did not usually shine at all. Some of its light passed into his eyes; and his voice, which had, begun to grow beautiful as soon as the star came to him, became ever more beautiful as he grew up. People liked to hear him speak, even if it was no more than a "good morning."