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That's happening because you'e referencing the page numbers in the book, not the page numbers in the pdf file that makes up the pdf. If the book pages are 596-597, the pdf  file pages may be 234-235. The snippet tool uses the pdf pages not the ones in the book. I don't think the book pages can be read by any pdf reader app. 
If I remember right, when you find the song in the pdf, and initiate the snippet tool, it shows the page being displayed.