glee vs singsong

glee

verb
  • To sing a glee (unaccompanied part song). 

noun
  • Music; minstrelsy; entertainment. 

  • Joy; happiness; great delight, especially from one's own good fortune or from another's misfortune. 

  • An unaccompanied part song for three or more solo voices, not necessarily merry. 

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 glee and singsong occurred in a corpus of books? (source: Google Ngram Viewer )