double bass vs gusle

double bass

noun
  • The largest stringed instrument of the violin family. 

  • The deepest of all male voices. 

gusle

noun
  • A single-stringed lute-like stringed instrument with a bowl-shaped body, held vertically in the lap and played a bow, originating among the Slavic peoples in the Balkans, especially in the Dinarides region. 

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