legato vs stilly

legato

adv
  • Smoothly, in a connected manner. 

noun
  • A style of performance characterized by smoothly connected notes. 

  • A passage that is played legato. 

stilly

adv
  • While still and calm. 

adj
  • silent; calm 

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