======================== unified (from filesystem) ========================
                                         'bitrate'  '178.616'
                                        'duration'  '430'
                                          'artist'  'Richard Wagner'
                                     'text_people'  ''
                                         'release'  'Opera Sampler'
                                           'title'  'Tannhauser: Freudig begrussen wir die edle Halle'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['opera', 'german', 'composers', 'romantic', 'classical']"
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '8'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '121.0'
                                             'key'  '2B'
                                        'acoustid'  ''
rest: ''

======================== rawer (from filesystem) ========================

'MCDI' (Music CD identifier)                        MCDI(data=b'\x00j\x01\x0c\x00\x10\x01\x00\x00\x00\x00\x00\x00\x10\x02\x00\x00\x00\x89\xf5\x00\x10\x03\x00\x00\x00\xdb\x1c\x00\x10\x04\x00\x00\x01-m\x00\x10\x05\x00\x00\x02\x0c\xad\x00\x10\x06\x00\x00\x02.\x18\x00\x10\x07\x00\x00\x02f\xa1\x00\x10\x08\x00\x00\x02\xaaU\x00\x10\t\x00\x00\x03)v\x00\x10\n\x00\x00\x03\x83g\x00\x10\x0b\x00\x00\x03\xd1\xa0\x00\x10\x0c\x00\x00\x03\xeb\x1d\x00\x10\xaa\x00\x00\x04\x19\x9e')
'TALB' (Album/Movie/Show title)                     'Opera Sampler'
'TBPM' (BPM (beats per minute))                     '121.0'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TENC' (Encoded by)                                 'Greg'
'TIT2' (Title/songname/content description)         'Tannhauser: Freudig begrussen wir die edle Halle'
'TKEY' (Initial key)                                '2B'
'TPE1' (Lead performer(s)/Soloist(s))               'Richard Wagner'
'TRCK' (Track number/Position in set)               '8'
'TSSE' (Software/Hardware and settings used for encoding)  'Audiograbber 1.80, LAME dll 3.92, VBR 2, Stereo, High quality'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'classical'
'TXXX:lastfmtags'                                   ['opera', 'german', 'composers', 'romantic', 'classical']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+2.01 dB'
'TXXX:replaygain_track_peak'                        '0.498512'

========================== row from database ==========================
                                              'id'  1213819
                                            'path'  /data/Music/Bulk/00instruments-classical/Wagner R. - 08 - Tannhauser- Freudig begrussen wir die edle Halle.mp3
                                         'working'  None
                                         'bitrate'  178
                                    'duration_sec'  430
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  9613707
                                           'mtime'  1620561889
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical R. 08 prerock classical or classical instruments
                                      'tag_artist'  Richard Wagner
                                     'tag_release'  Opera Sampler
                                       'tag_title'  Tannhauser: Freudig begrussen wir die edle Halle
                                             'bpm'  121.0
                                    'search_title'  'begrussen':4 'die':6 'edle':7 'freudig':3 'halle':8 'tannhauser':1,2 'wir':5
                                   'search_artist'  'richard':1 'wagner':2
                                  'search_release'  'opera':1 'sampler':2
                                     'search_rest'  '00instruments':1 'classical':2 'instruments':7 'or':6 'prerock':5 'r':3,4
                                    'search_combo'  '00instruments':13 'begrussen':4A 'classical':14 'die':6A 'edle':7A 'freudig':3A 'halle':8A 'instruments':19 'opera':11C 'or':18 'prerock':17 'r':15,16 'richard':9B 'sampler':12C 'tannhauser':1A,2A 'wagner':10B 'wir':5A
                                    'tag_tracknum'  8
                                      'num_images'  0
                                             'key'  2B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['opera', 'german', 'composers', 'romantic', 'classical']
                                        'tag_date'  
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1620561888.839991  (2021-05-09 14:04:48)
                             'size'  9613707