Between Wood and Strings

She is the pipa fairy of the folk music department. Her tone is delicate and as gentle as a gurgling stream, nourishing his cracked and dry heart.   He is a young and promising pianist. His music is as deep and unpredictable as the sea, as deep as the sea and as wild as the waves, leading her to see the vast distance.   On the day they first met, Mu Yishu tried playing the prelude, and You Muyuan's piano sound cut through like a wave, hitting her violently. After the hearty ensemble ended, he smiled lightly and said, "You got the wrong person."   On the day of the confession, You Muyuan kissed her between the eyebrows and said in a deep voice: "Between my wood and the string, it's you." Mu Yishu immediately felt a sore nose and threw herself into his arms.   On the day of seeing him off, Mu Yishu tugged at the hem of his clothes and asked in a low voice, "What exactly do you mean by 'wood and strings'?" You Muyuan smiled and held the little girl whose reflex arc was slow for half a month into his arms, and said in his usual clear and steady voice:   "The wooden core strikes the strings, and the vibration is amplified by the resonance box, and the piano has sound. The layer of wool felt wrapping the wooden core determines the temperature of the sound."   "Yishu, you are my wool felt."   "With you, I am complete."