refrain vs sample

refrain

noun
  • The chorus or burden of a song repeated at the end of each verse or stanza. 

  • A much repeated comment, complaint, or saying. 

verb
  • To stop oneself from some action or interference; to abstain. 

  • To abstain from (food or drink). 

sample

noun
  • Gratuitous borrowing of easily recognised phases (or moments) from other music (or movies) in a recording. 

  • A small quantity of food for tasting, typically given away for free. 

  • A subset of a population selected for measurement, observation or questioning, to provide statistical information about the population. 

  • A part or snippet of something taken or presented for inspection, or shown as evidence of the quality of the whole; a specimen. 

  • A small piece of some goods, for determining quality, colour, etc., typically given away for free. 

verb
  • To reduce a continuous signal (such as a sound wave) to a discrete signal. 

  • To make or show something similar to a sample. 

  • To take or to test a sample or samples of. 

  • To reuse a portion of (an existing sound recording) in a new piece of music. 

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