How can I get Wikipedia embedded audio and video to play back in Safari?
Wikipedia is not directly using the HTML5 audio tag (which it should be) and is not supporting media in Safari at this time (likely due to it's lack of popularity) so It's recommended to use Chrome (which is basically safari that Google improved upon) or Firefox.

example page:
https://commons.wikimedia.org/wiki/Category:Libre_music

document.querySelectorAll('audio').length
0


The "compatibility" layer (mw.PopUpMediaTransform) they are trying to use makes the audio tag after you click play but in safari it tries some java applet that breaks.