First Quarter Moon on the Seventh Day of July

He played the erhu to the waxing moon every night. People in the alley found it noisy, but no one had the heart to interrupt. The music seemed to be talking and sighing. Later, the neighbors found out that his wife had been missing on a night of the first quarter moon for ten years. He was afraid that she would not be able to find her way home, so he played her favorite song "Er Quan Ying Yue" every first quarter moon. That winter, a strange woman walked into the alley following the sound of the piano. She had white hair and a yellowed train ticket in her hand. The moon is missing a corner, but people are round.