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<https://anchorfact.org/kb/arts/classical-music-periods>
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  schema:headline "Classical Music Periods" ;
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  af:confidence "medium" ;
  af:confidenceScore "0.615" ;
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<https://anchorfact.org/kb/arts/classical-music-periods>
  schema:citation <https://wwnorton.com/books/9780393317121> ;
  af:sourceTier "B" .

<https://anchorfact.org/kb/arts/classical-music-periods>
  schema:citation <https://us.macmillan.com/books/9780312427719/therestisnoise> ;
  af:sourceTier "B" .