First of all, I am not an expert. I'm just saying my own opinion: there is no connection between the two. They each have their own reasons. The first few notes are really similar, but the triple beat in Morning Song is streamlined, giving people the feeling that the sun rises, and portraying the image by constantly changing the tone. But the grassland listens to the oriental flavor. From the first feeling of rhythm and melody, I didn't feel their similarity either. Notes are limited, but music is infinite.