author vs clef

author

verb
  • To create a work as its author. 

noun
  • Someone who writes books for a living. 

  • The originator or creator of a work, especially of a literary composition. 

clef

noun
  • A symbol found on a musical staff that indicates the pitches represented by the lines and the spaces on the staff 

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