iTunes Genre Editor
This program allows you to edit the genre art that iTunes displays in Genre View, as well as add art for your own genres.
Genre View has evolved through various versions of iTunes. In the latest version as of this writing, v12.2.2, Genre view displays the genres in a sidebar to the left of the window, with the music at the right. In older versions, genre view looked similar to the current Album View, with each genre having a big square which you could double-click to see the associated music (see here).
iTunes 12.2 Genre View
Please note that this program modifies iTunes files. Use at your own risk. I am not responsible for any damage, crashes, and/or errors that may result from your use of the program.
This program was designed to be used under Mac OS X 10.10.5 and iTunes 12.2.2. Using older versions of OS X or iTunes is not recommended. After updating to a newer version of OS X or iTunes, please wait for an update to this program to be released before using. Thanks!
Download here. Note: Beta release.
This Flickr group has a good number of possible genre art. If you have made some of your own, consider adding it to the group, or send it to me and I will host it on this page.
You can find the source code on Github. Send me a pull request if you make any changes, so I can incorporate them in!