index.js
function getAbcKey(fifths, mode) {
  if (typeof mode === 'undefined' || mode === null) mode = 'major';
  return circleOfFifths[mode][fifths];
}
function getAbcKey(fifths, mode) {
  if (typeof mode === 'undefined' || mode === null) mode = 'major';
  return circleOfFifths[mode][fifths];
}
function getAbcKey ( fifths , mode ) { if ( typeof mode === 'undefined' || mode === null ) mode = 'major' ; return circleOfFifths [ mode ] [ fifths ] ; }
Returns the key for abc notation from given fifths
@param {number} fifths - The position inside the circle of fifths
@param {string|undefined} mode - The mode (major / minor)
@returns {string}
Returns the key for abc notation from given fifths