The question you want to ask is "On August 15th, when the moon was bright, Grandpa gave me moon cakes. What song is it? " ? The lyrics come from the song "Grandpa hits me with moon cakes".

The Moon on August 15th, also known as Grandpa Beats Moon Cakes for me, is a folk nursery rhyme composed by Liang Lengguang. It is an episode of the feature film "Ah, Cradle" filmed in the early 1980s, and it is sung for children's voices.

Lyrics excerpt: August 15, the moon is in the sky. Grandpa plays with moon cakes for me. Moon cakes are round, sweet and fragrant. A moon cake, full of affection. Grandpa is an old Red Army. Grandpa treated me and kissed me.