cello vs upright bass

cello

noun
  • A large unfretted stringed instrument of the violin family with four strings tuned (lowest to highest) C-G-D-A and an endpin to support its weight, usually played with a bow. 

  • cellophane 

upright bass

noun
  • A double bass. (lowest-pitched of instruments of violin family) 

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