This second half of the middle section is tricky . . . . . see
I keep playing something up an octave like the first part.
This song uses two minor chords "D" minor and "A" minor.
They repeat back and forth over and over with a simple melody.
Then does something similar with "F" and "C" major.
It starts off in "minor" then resolves in "major".
Many songs use major and minor together but this like singing,
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"It is raining, it is raining, it is raining, it is raining"
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. . . then
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"It is sunny, it is sunny, it is sunny, it is sunny."
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This is a poor analogy but this is probably what makes the song so haunting and happy.