<https://muziclub.com/chord-change-exercise-for-beginners-guitar-lesson-change-chords-faster-and-smoother/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://muziclub.com/chord-change-exercise-for-beginners-guitar-lesson-change-chords-faster-and-smoother/>