Final answer:
The quoted passage is from the book 'The Chronicles of Narnia: The Silver Chair' by C.S. Lewis. It describes the captivating and mystical voice of Aslan, the lion character in the series.
Step-by-step explanation:
The quoted passage is from the book 'The Chronicles of Narnia: The Silver Chair' by C.S. Lewis. The voice that the character D-i-g-o-r-y hears is the singing of Aslan, the great lion and central character in the series. This passage describes the mystical and captivating nature of Aslan's voice, which is described as coming from all directions and sometimes appearing to come from the earth itself.
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