======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '191'
                                          'artist'  'Yo-Yo Ma with The Amsterdam Baroque Orchestra & Ton Koopman'
                                     'text_people'  'Antonio Vivaldi'
                                         'release'  "Vivaldi's Cello"
                                           'title'  'Concerto in G Minor for 2 Cellos, RV 531: Allegro'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
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 "'q-chart-3', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
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                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  ''
                                            'date'  '2004'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '86.4'
                                             'key'  '11A'
                                        'acoustid'  ''
rest: ''

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'TALB' (Album/Movie/Show title)                     "Vivaldi's Cello"
'TBPM' (BPM (beats per minute))                     '86.4'
'TCOM' (Composer)                                   'Antonio Vivaldi'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '2004'
'TIT2' (Title/songname/content description)         'Concerto in G Minor for 2 Cellos, RV 531: Allegro'
'TKEY' (Initial key)                                '11A'
'TLEN' (Length)                                     '191693'
'TPE1' (Lead performer(s)/Soloist(s))               'Yo-Yo Ma'
'TPE2' (Band/orchestra/accompaniment)               'Yo-Yo Ma with The Amsterdam Baroque Orchestra & Ton Koopman'
'TPUB' (Publisher)                                  'Sony Classical'
'TRCK' (Track number/Position in set)               '3'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.80 dB'
'TXXX:replaygain_track_peak'                        '0.821776'

========================== row from database ==========================
                                              'id'  1526584
                                            'path'  /data/Music/Bulk/00instruments-classical/Yo-Yo Ma/Yo-Yo Ma with The Amsterdam Baroque Orchestra & Ton Koopman/Vivaldi_s Cello/03 Concerto in G Minor for 2 Cellos, RV 531_ Allegro.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  191
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  7726077
                                           'mtime'  1620561907
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Vivaldi_s 03 531_ prerock classical classical instruments
                                      'tag_artist'  Yo-Yo Ma with The Amsterdam Baroque Orchestra & Ton Koopman
                                     'tag_release'  Vivaldi's Cello
                                       'tag_title'  Concerto in G Minor for 2 Cellos, RV 531: Allegro
                                             'bpm'  86.4
                                    'search_title'  '2':6 '531':10,11 'allegro':12 'cellos':7,8 'concerto':1 'for':5 'g':3 'in':2 'minor':4 'rv':9
                                   'search_artist'  'amsterdam':7 'baroque':8 'koopman':11 'ma':4 'orchestra':9 'the':6 'ton':10 'with':5 'yo':1,2 'yoyo':3
                                  'search_release'  'cello':4 's':2 'vivaldi':1 'vivaldis':3
                                     'search_rest'  '00instruments':1 '531':5 'classical':2 'instruments':7 'prerock':6 's':4 'vivaldi':3
                                    'search_combo'  '00instruments':28 '2':6A '531':10A,11A,32 'allegro':12A 'amsterdam':19B 'baroque':20B 'cello':27C 'cellos':7A,8A 'classical':29 'concerto':1A 'for':5A 'g':3A 'in':2A 'instruments':34 'koopman':23B 'ma':16B 'minor':4A 'orchestra':21B 'prerock':33 'rv':9A 's':25C,31 'the':18B 'ton':22B 'vivaldi':24C,30 'vivaldis':26C 'with':17B 'yo':13B,14B 'yoyo':15B
                                    'tag_tracknum'  3
                                      'num_images'  1
                                             'key'  11A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  2004
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561907.4767487  (2021-05-09 14:05:07)
                             'size'  7726077