<https://www.guitarworld.com/news/learn-to-play-guitar-and-have-fun-doing-it-with-the-feature-packed-gibson-app#navigation>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.guitarworld.com/news/learn-to-play-guitar-and-have-fun-doing-it-with-the-feature-packed-gibson-app>