duet vs solo

duet

verb
  • To perform a duet. 

  • To perform (sing, play, etc.) as a duet. 

  • (of two people) To say at the same time, to chorus. 

  • To communicate (warnings, mating calls, etc.) through song. 

noun
  • A musical composition in two parts, each performed by a single voice (singer, instrument or univoce ensemble). 

  • A song composed for and/or performed by a duo. 

  • A pair or couple, especially one that is harmonious or elegant. 

solo

verb
  • To perform a solo. 

  • To perform something in the absence of anyone else. 

  • To drop the ball and then toe-kick it upward into the hands. 

adv
  • Alone, without a companion. 

noun
  • A job or performance done by one person alone. 

  • A piece of music for one performer. 

  • A card game similar to whist in which each player plays against the others in turn without a partner 

  • A single shot of espresso. 

  • An instance of soloing the football. 

adj
  • Of, or relating to, a musical solo. 

  • Without a companion or instructor. 

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