A-sharp vs B-flat

A-sharp

noun

  • A tone one semitone higher than A, denoted A♯. 

  • The key of A sharp major 

B-flat

noun

  • The note one semitone below B, notated B♭. 

  • A bedbug. 

How often have the words A-sharp and B-flat occurred in a corpus of books? (source: Google Ngram Viewer )