======================== unified (from filesystem) ========================
                                         'bitrate'  '256.0'
                                        'duration'  '880'
                                          'artist'  'Lazar Berman, London Symphony Orchestra & Claudio Abbado'
                                     'text_people'  'Rachmaninoff'
                                         'release'  'Rachmaninoff: Piano Concerto No.3'
                                           'title'  'Piano Concerto No.3 in D Minor, Op.30: III. Finale: Alla breve'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
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 "'Q-PIANO-4', 'q-chart-3', 'q-drums-1', 'q-other-3', 'q-vocals-1', "
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                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  '3'
                                            'date'  '1976'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '141.6'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     'Rachmaninoff: Piano Concerto No.3'
'TBPM' (BPM (beats per minute))                     '141.6'
'TCOM' (Composer)                                   'Rachmaninoff'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1976'
'TIT2' (Title/songname/content description)         'Piano Concerto No.3 in D Minor, Op.30: III. Finale: Alla breve'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Lazar Berman, London Symphony Orchestra & Claudio Abbado'
'TRCK' (Track number/Position in set)               '3/3'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'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-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.92 dB'
'TXXX:replaygain_track_peak'                        '1.008973'

========================== row from database ==========================
                                              'id'  268552
                                            'path'  /data/Music/Bulk/00instruments-classical/Lazar Berman, London Symphony Orchestra & Claudio Abbado/Rachmaninoff_ Piano Concerto No.3/03 Piano Concerto No.3 in D Minor, Op.30_ III. Finale_ Alla breve.mp3
                                         'working'  None
                                         'bitrate'  256
                                    'duration_sec'  880
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  28212065
                                           'mtime'  1620574188
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Rachmaninoff_ 03 Op.30_ Finale_ prerock classical classical instruments
                                      'tag_artist'  Lazar Berman, London Symphony Orchestra & Claudio Abbado
                                     'tag_release'  Rachmaninoff: Piano Concerto No.3
                                       'tag_title'  Piano Concerto No.3 in D Minor, Op.30: III. Finale: Alla breve
                                             'bpm'  141.6
                                    'search_title'  '3':4 '30':11 'alla':17 'breve':18 'concerto':2 'd':7 'finale':15,16 'iii':13,14 'in':6 'minor':8,9 'no':3 'no3':5 'op':10 'op30':12 'piano':1
                                   'search_artist'  'abbado':8 'berman':2,3 'claudio':7 'lazar':1 'london':4 'orchestra':6 'symphony':5
                                  'search_release'  '3':6 'concerto':4 'no':5 'no3':7 'piano':3 'rachmaninoff':1,2
                                     'search_rest'  '00instruments':1 '30':5 'classical':2 'finale':7 'instruments':9 'op':4 'op30':6 'prerock':8 'rachmaninoff':3
                                    'search_combo'  '00instruments':34 '3':4A,32C '30':11A,38 'abbado':26B 'alla':17A 'berman':20B,21B 'breve':18A 'classical':35 'claudio':25B 'concerto':2A,30C 'd':7A 'finale':15A,16A,40 'iii':13A,14A 'in':6A 'instruments':42 'lazar':19B 'london':22B 'minor':8A,9A 'no':3A,31C 'no3':5A,33C 'op':10A,37 'op30':12A,39 'orchestra':24B 'piano':1A,29C 'prerock':41 'rachmaninoff':27C,28C,36 'symphony':23B
                                    'tag_tracknum'  3
                                      'num_images'  1
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-4', '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-PLAY-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  1976
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620574188.298573  (2021-05-09 17:29:48)
                             'size'  28212065