Answer :
The main reason why the child weeps when he hears the song is that the song the narrator sang was a sad song.
This is because the given poem talks about the narrator and a child who asked him to pipe a song about a lamb and as he piped with merry cheer, the child asked that he pipe it again.
This time, the child wept and immediately requested he drop the pipe and sing only songs of happy cheer and this made him happy.
What is a Poem?
This refers to the collection of lines by a poet that is structured in stanzas and verses to pass a message.
Hence, we can see that the main reason why the child weeps when he hears the song is that the song the narrator sang was a sad song.
This is because the given poem talks about the narrator and a child who asked him to pipe a song about a lamb and as he piped with merry cheer, the child asked that he pipe it again.
This time, the child wept and immediately requested he drop the pipe and sing only songs of happy cheer and this made him happy.
Read more about poetry here:
https://brainly.com/question/9086116
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