<https://secure.gravatar.com/avatar/f42dc9ce5dc57014307130af1de1d6c2?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.beckmesser.com/retos-digitales-para-la-musica-clasica/>