falsetto vs singsong

falsetto

verb
  • To sing or utter in falsetto. 

noun
  • A person who sings in falsetto. 

  • The "false" (singing) voice in any human, usually airy and lacking a purity of vowels; created by utilizing the next highest vocal folds above those used for speech and normal range singing. It is commonly confused with the head voice register. 

singsong

verb
  • To utter in a singsong voice. 

adj
  • Like a piece of singsong; simple and melodic, varying in pitch (of tone of voice etc.) 

noun
  • A drawling or monotonous tone, as of a badly executed song. 

  • Bad singing or poetry. 

  • An informal gathering at which songs are sung; a singing session. 

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

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