Guess notes from stave.
var PianoGame = require('piano-game');
var audioContext = require('audio-context');
var game = new PianoGame({
element: document.querySelector('.piano-game'),
context: audioContext,
range: ['c2', 'c#3'], //range of keys to ask
maxNotes: 4, //maximum number of notes in a question
requireOctave: false //require exact octave for a note
});