From MediaWiki Widgets
This widget shows an audio-only Youtube player to a wiki page.
It simply takes the video ID as the 'id' parameter, and optionally 'width' in px (default 250). Height is fixed as it is this that makes it an audio-only player.
Created by Gerard Boyers
Using this widget
For information on how to use this widget, see widget description page on MediaWikiWidgets.org.