<https://www.concertina.net/forums/index.php?/topic/21399-alawon-cymreig-welsh-tunes/#comment-198506>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.concertina.net/forums/index.php?/topic/21399-alawon-cymreig-welsh-tunes/#comment-198491>