fabricate vs play by ear

fabricate

verb
  • To invent and form; to forge; to devise falsely. 

  • To form by art and labor; to manufacture; to produce. 

  • To form into a whole by uniting its parts; to construct; to build. 

  • To cut up an animal as preparation for cooking, particularly used in reference to fowl. 

play by ear

verb
  • To do by guessing, intuition, or trial and error; to react to events as they occur; improvise 

  • To play guided by one's musical ear, rather than from a written score. 

How often have the words fabricate and play by ear occurred in a corpus of books? (source: Google Ngram Viewer )