a cappella vs composition

a cappella

noun
  • A vocal performance with no instrumental accompaniment. 

adv
  • In a manner of a choir with no instrumental accompaniment; literally, "in the style of the (Sistine) Chapel (in Rome)", such as a musical Mass done a cappella. 

adj
  • Singing solely or mainly without instrumental accompaniment. 

  • Related to a form of purely vocal music mostly associated with American college performance groups. 

composition

noun
  • A work of music, literature or art. 

  • The arrangement and flow of elements in a picture. 

  • The compounding of two velocities or forces into a single equivalent velocity or force. 

  • The general makeup of a thing or person. 

  • The proportion of different parts to make a whole. 

  • An essay. 

  • A mixture or compound; the result of composing. 

  • an agreement or compromise by which a creditor or group of creditors accepts partial payment from a debtor. 

  • The formation of compound words from separate words. 

  • Applying a function to the result of another. 

  • Typesetting. 

  • Synthesis as opposed to analysis. 

  • Way to combine simple objects or data types into more complex ones. 

  • The act of putting together; assembly. 

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