commiserate vs harp

commiserate

verb
  • To sympathize; condole. 

  • To offer condolences jointly with; express sympathy with. 

  • To feel or express compassion or sympathy for (someone or something). 

harp

verb
  • To repeatedly mention a subject. 

  • To play (a tune) on the harp. 

  • To play on (a harp or similar instrument). 

noun
  • Any instrument of the same musicological type. 

  • A grain sieve. 

  • A harmonica. 

  • A musical instrument consisting of a body and a curved neck, strung with strings of varying length that are stroked or plucked with the fingers and are vertical to the soundboard when viewed from the end of the body 

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