// Composer
AppleTrackAuthorBox composer = getOrNull(apple, AppleTrackAuthorBox.class);
addMetadata(XMPDM.COMPOSER, metadata, composer);
// Genre
AppleGenreBox genre = getOrNull(apple, AppleGenreBox.class);
addMetadata(XMPDM.GENRE, metadata, genre);
// Year
AppleRecordingYear2Box year = getOrNull(apple, AppleRecordingYear2Box.class);
if (year != null) {