From http://stackoverflow.com/questions/8782619/how-to-build-a-collection-model-from-nested-json-with-backbone-js - Getting to the JSON of the nested models in Backbone.js

new_gist_file

var AmericasNextTopModel = Backbone.Models.extend({
    initialize: function(){

        this.set({
             clefs: new ClefCollection(this.get('clefs')),
             accidentals: new AccidentalCollection(this.get('accidentals')),
             notes: new NoteCollection(this.get('notes')),
             rests: new RestCollection(this.get('rests'))
        });
    }
});