This app was removed from the App Store.
Mac OS Music
✔ SongCover mainly used to find the english song's cover automatically. And it also auto find the album, artist of the songs.
✔ NOTE: SongCover worked with the iTunes, so keep the iTunes opening to make sure everything is right.
√ Don't auto discover the song cover when launched the app, because it may cause freeze. Let the user manually use context menu to update the song tagger.