sing-song vs solo

sing-song

noun
  • A kind of verse with a simple, song-like rhythm. 

  • An informal gathering involving group singing. 

adj
  • Like a piece of sing-song; simple and melodic, song-like. 

solo

noun
  • A piece of music for one performer. 

  • A job or performance done by one person alone. 

  • 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. 

adv
  • Alone, without a companion. 

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

  • Without a companion or instructor. 

verb
  • To perform something in the absence of anyone else. 

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

  • To perform a solo. 

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