If you've ever looked at Wikipedia articles for music, I'm sure you've seen the following icon: https://commons.wikimedia.org/wiki/File:Gnome-mime-sound-openclipart.svg
See, for example, https://en.wikipedia.org/wiki/Goldberg_Variations
The icon is fairly sloppy and isn't even symmetrical. I tried to clean it up a few months ago, but I've never really been happy with it. While this icon is not technically part of the MediaWiki software, it's use on our projects is ubiquitous. If any designers feel inspired to create a replacement, please let me know!
Ryan Kaldari