Here are collections of photos good for decoration of music games content.
Games for Music Pixelfed account keeps a lot of images of interest, many with open licenses.
https://pixelfed.social/gamesformusic
Unsplash is a useful resource with liberally licensed photos. Here is a collection of works that relate to our topic.
https://unsplash.com/collections/10515583/music-games-%2F-game-pieces
There used to be a system on Wikidot to quickly embed Flickr photos, and these are in use throughout our page, especially images from the Commons section, where all are in public domain. That system is now sadly broken — it's not that easy to use anymore.
http://thepracticeshoppe.com allowed us by e-mail to use photos of their products. The page itself is not only a shop but also a library of games for practicing music (for kids). If you need that kind of music games, check it out. On a page there is a lot of cool photos of different music dice.
Your own work
If you have something that may be useful for music games, upload it here (attach it to this page with "Files" button below). It will be accessible from other pages with image command.
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If you think anything should be added to this subpage, please drop a hint or a link for future editors.