intonation vs vox

intonation

noun
  • The rise and fall of the voice in speaking. 

  • Emotive stress used to increase the power of delivery in speech. 

  • Reciting in a musical prolonged tone; intonating or singing of the opening phrase of a plain-chant, psalm, or canticle by a single voice, as of a priest. 

  • A sound made by, or resembling that made by, a musical instrument. 

  • Singing or playing in good tune or otherwise. 

vox

noun
  • The voice, especially one's singing voice; vocals. 

How often have the words intonation and vox occurred in a corpus of books? (source: Google Ngram Viewer )