a cappella vs deserted

a cappella

noun

  • A vocal performance with no instrumental accompaniment. 

adj

  • Singing solely or mainly without instrumental accompaniment. 

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

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. 

deserted

adj

  • Abandoned, without people. 

  • desolate 

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