Album Art changer - Features:-
Set album art per song basis instead of album
High quality album art
Bulk update missing album art
Can save both to tags and android database
Saving to tags lets the cover art to persist while moving the mp3 to different computer or device
Choose cover art from gallery
Edit tags such as title,album,artist
View beautiful cover art by swiping from one cover art to another
Automatically updates obsolete tags to newer tags.
If your music player doesn't detects album art, clear it's cache from settings->apps->your app->clear data.