How do I get Gallery and Photos to ignore the images in a specified directory?

When I open Gallery or Google Photos, there are dozens or hundreds of albums and photos that have been automatically pulled from my Music directory, where there are lots of JPEGs that are cover art for MP3 files. They make it so that it is very hard to find particular photos I've taken with my camera, and in any case it is useless to have them displayed there as I never want to browse music cover art in my Gallery. I can't find any option to exclude folders, though. **How do I make it so the image files in my Music directory are not included in Gallery or Google Photos?**