hip-hop vs vocalize

hip-hop

verb
  • To perform hip-hop music. 

  • To move by hopping or with a hopping motion. 

noun
  • An Afro-American urban youth culture based on rap music, breakdancing etc. 

  • A form of popular and dance music featuring strong percussion and a powerful rhythm, usually accompanied by rapping. 

vocalize

verb
  • To sing without using words. 

  • To produce noises or calls from the throat. 

  • To add vowel points to a consonantal script (e.g. niqqud in Hebrew) 

  • To express with the voice, to utter. 

  • To turn a consonant into a vowel. 

How often have the words hip-hop and vocalize occurred in a corpus of books? (source: Google Ngram Viewer )