I use iCloud to sync music files. On my Mac, I changed some song information such as genre or artist name. How can I sync the changes on my Mac's iTunes with iCloud so that all my iPad and iPhone iTunes have the same change?
As far as I know these changes should be applied automatically. If not, try Store -> "Update iTunes Match" to apply the changes. You can also use "Add to iCloud" for songs which haven't been matched before.