Repository: yt-dlp/yt-dlp
File: yt_dlp/extractor/idagio.py (Python)

Code before:
    _TESTS = [{
        'url': 'https://app.idagio.com/recordings/30576934',
        'info_dict': {
            'id': '30576934',
            'title': 'Variations on an Original Theme op. 36',
            'composers': ['Edward Elgar'],
            'artists': ['Vasily Petrenko', 'Royal Liverpool Philharmonic Orchestra'],
            'genres': ['Orchestral', 'Other Orchestral Music'],
            'timestamp': 1554474370,
            'modified_timestamp': 1554474370,
            'modified_date': '20190405',
            'upload_date': '20190405',
        },
        'playlist_count': 15,
    }]
    _API_URL_TMPL = 'https://api.idagio.com/v2.0/metadata/recordings/{}'

    def _parse_playlist_metadata(self, playlist_info):
        return traverse_obj(playlist_info, {
            'title': ('work', 'title', {str}),
            'timestamp': ('created_at', {int_or_none(scale=1000)}),
            'modified_timestamp': ('created_at', {int_or_none(scale=1000)}),
            'location': ('location', {str}),
            'artists': (('conductor', ('ensembles', ...), ('soloists', ...)), 'name', {str}, all),
            'composers': ('work', 'composer', 'name', {str}, all),
            'genres': ('work', ('genre', 'subgenre'), 'title', {str}, all),
            'tags': ('tags', ..., {str}),
        })


class IdagioAlbumIE(IdagioPlaylistBaseIE):
    _VALID_URL = r'https?://(?:www\.)?app\.idagio\.com/albums/(?P<id>[\w-]+)'
    _TESTS = [{
        'url': 'https://app.idagio.com/albums/elgar-enigma-variations-in-the-south-serenade-for-strings',
        'info_dict': {
            'id': 'a9f139b8-f70d-4b8a-a9a4-5fe8d35eaf9c',
            'display_id': 'elgar-enigma-variations-in-the-south-serenade-for-strings',
            'title': 'Elgar: Enigma Variations, In the South, Serenade for Strings',
            'description': '',
            'thumbnail': 'https://idagio-images.global.ssl.fastly.net/albums/880040420521/main.jpg',
            'artists': ['Vasily Petrenko', 'Royal Liverpool Philharmonic Orchestra', 'Edward Elgar'],
            'timestamp': 1553817600,
            'upload_date': '20190329',
            'modified_timestamp': 1562566559.0,
            'modified_date': '20190708',
        },
        'playlist_count': 19,
    }, {
        'url': 'https://app.idagio.com/albums/brahms-ein-deutsches-requiem-3B403DF6-62D7-4A42-807B-47173F3E0192',
        'info_dict': {
            'id': '2862ad4e-4a61-45ad-9ce4-7fcf0c2626fe',

Review comment (suggestion):
```suggestion
            'genres': ('work', ('genre', 'subgenre'), 'title', {str}),
```

Code after:
    _TESTS = [{
        'url': 'https://app.idagio.com/recordings/30576934',
        'info_dict': {
            'id': '30576934',
            'title': 'Variations on an Original Theme op. 36',
            'composers': ['Edward Elgar'],
            'artists': ['Vasily Petrenko', 'Royal Liverpool Philharmonic Orchestra'],
            'genres': ['Orchestral', 'Other Orchestral Music'],
            'timestamp': 1554474370,
            'modified_timestamp': 1554474370,
            'modified_date': '20190405',
            'upload_date': '20190405',
        },
        'playlist_count': 15,
    }]
    _API_URL_TMPL = 'https://api.idagio.com/v2.0/metadata/recordings/{}'

    def _parse_playlist_metadata(self, playlist_info):
        return traverse_obj(playlist_info, {
            'title': ('work', 'title', {str}),
            'timestamp': ('created_at', {int_or_none(scale=1000)}),
            'modified_timestamp': ('created_at', {int_or_none(scale=1000)}),
            'location': ('location', {str}),
            'artists': (('conductor', ('ensembles', ...), ('soloists', ...)), 'name', {str}),
            'composers': ('work', 'composer', 'name', {str}, all),
            'genres': ('work', ('genre', 'subgenre'), 'title', {str}),
            'tags': ('tags', ..., {str}),
        })


class IdagioAlbumIE(IdagioPlaylistBaseIE):
    _VALID_URL = r'https?://(?:www\.)?app\.idagio\.com/albums/(?P<id>[\w-]+)'
    _TESTS = [{
        'url': 'https://app.idagio.com/albums/elgar-enigma-variations-in-the-south-serenade-for-strings',
        'info_dict': {
            'id': 'a9f139b8-f70d-4b8a-a9a4-5fe8d35eaf9c',
            'display_id': 'elgar-enigma-variations-in-the-south-serenade-for-strings',
            'title': 'Elgar: Enigma Variations, In the South, Serenade for Strings',
            'description': '',
            'thumbnail': 'https://idagio-images.global.ssl.fastly.net/albums/880040420521/main.jpg',
            'artists': ['Vasily Petrenko', 'Royal Liverpool Philharmonic Orchestra', 'Edward Elgar'],
            'timestamp': 1553817600,
            'upload_date': '20190329',
            'modified_timestamp': 1562566559.0,
            'modified_date': '20190708',
        },
        'playlist_count': 19,
    }, {
        'url': 'https://app.idagio.com/albums/brahms-ein-deutsches-requiem-3B403DF6-62D7-4A42-807B-47173F3E0192',
        'info_dict': {
            'id': '2862ad4e-4a61-45ad-9ce4-7fcf0c2626fe',