AppleArtistBox artist = getOrNull(apple, AppleArtistBox.class);
addMetadata(TikaCoreProperties.CREATOR, metadata, artist);
addMetadata(XMPDM.ARTIST, metadata, artist);
// Album Artist
AppleArtist2Box artist2 = getOrNull(apple, AppleArtist2Box.class);
addMetadata(XMPDM.ALBUM_ARTIST, metadata, artist2);
// Album
AppleAlbumBox album = getOrNull(apple, AppleAlbumBox.class);
addMetadata(XMPDM.ALBUM, metadata, album);