======================== unified (from filesystem) ========================
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                                        'duration'  '488'
                                          'artist'  'Antonín Dvořák'
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                                           'title'  'Cello Concerto Op. 104 Yo-Yo M'
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                                      'lastfmtags'  "['czech', 'composers', 'composer', 'romantic', 'classical']"
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                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '125.0'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

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'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TIT2' (Title/songname/content description)         'Cello Concerto Op. 104 Yo-Yo M'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Antonín Dvořák'
'TRCK' (Track number/Position in set)               '94'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
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'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['czech', 'composers', 'composer', 'romantic', 'classical']
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'TXXX:q-drums'                                      '1'
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'TXXX:q-mixbeat'                                    '1'
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'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+4.67 dB'
'TXXX:replaygain_track_peak'                        '0.964088'

========================== row from database ==========================
                                              'id'  1213765
                                            'path'  /data/Music/Bulk/00instruments-classical/dvorak/Dvorak Cello Concerto Op. 104 Yo-Yo Ma Rondo for Cello and Orchestra, Op. 94.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  488
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  7812242
                                           'mtime'  1620561913
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Dvorak Ma Rondo for and Orchestra, 94 prerock classical classical instruments
                                      'tag_artist'  Antonín Dvořák
                                     'tag_release'  dvorak
                                       'tag_title'  Cello Concerto Op. 104 Yo-Yo M
                                             'bpm'  125.0
                                    'search_title'  '104':5 'cello':1 'concerto':2 'm':9 'op':3,4 'yo':6,7 'yoyo':8
                                   'search_artist'  'antonin':1,2 'dvorak':3,4
                                  'search_release'  'dvorak':1
                                     'search_rest'  '00instruments':1 '94':10 'and':7 'classical':2 'dvorak':3 'for':6 'instruments':12 'ma':4 'orchestra':8,9 'prerock':11 'rondo':5
                                    'search_combo'  '00instruments':15 '104':5A '94':24 'and':21 'antonin':10B,11B 'cello':1A 'classical':16 'concerto':2A 'dvorak':12B,13B,14C,17 'for':20 'instruments':26 'm':9A 'ma':18 'op':3A,4A 'orchestra':22,23 'prerock':25 'rondo':19 'yo':6A,7A 'yoyo':8A
                                    'tag_tracknum'  94
                                      'num_images'  0
                                             'key'  6A
                                           '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-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['czech', 'composers', 'composer', 'romantic', 'classical']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561913.336723  (2021-05-09 14:05:13)
                             'size'  7812242