======================== unified (from filesystem) ========================
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                                        'duration'  '401'
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                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
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                                      'tracktotal'  '13'
                                            'date'  '1996'
                                        'comments'  ''
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rest: ''

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

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'TCON' (Content type, a.k.a. Genre)                 'hip hop or rnb or rap or turntablism'
'TDOR' (Original release time)                      '1996'
'TDRC' (Recording time)                             '1996-11-19'
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'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'DJ Shadow'
'TPE2' (Band/orchestra/accompaniment)               'DJ Shadow'
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'TPUB' (Publisher)                                  'FFRR/Mo Wax'
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'TSOP' (Performer sort order)                       'Shadow, DJ'
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'TXXX:lastfmtags'                                   ['electronica', 'electronic', 'trip hop', 'hip hop', 'turntablism']
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'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
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========================== row from database ==========================
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                                            'path'  /data/Music/Bulk/00poprockelectronic/DJ Shadow/DJ.Shadow.Endtroducing.1998/02 - DJ Shadow - Building Steam With A Grain Of Salt.mp3
                                         'working'  None
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                                    'duration_sec'  401
                                           'genre'  hip hop or rnb or rap or turntablism
                                        'filesize'  9699274
                                           'mtime'  1620568765
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic DJ.Shadow.Endtroducing.1998 02 A Of hip hop or rnb or rap or turntablism
                                      'tag_artist'  DJ Shadow
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                                       'tag_title'  Building Steam With a Grain of Salt
                                             'bpm'  109.883
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                                   'search_artist'  'dj':1 'shadow':2
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                                    'tag_tracknum'  2
                                      'num_images'  0
                                             'key'  5A
                                           'quals'  ['Q-HHRNBTT-2', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-3', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-3', 'q-chart-3', 'q-other-2', 'Q-HAP-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['electronica', 'electronic', 'trip hop', 'hip hop', 'turntablism']
                                        'tag_date'  1996
                                     'discogstags'  ['electronic', 'hip hop', 'instrumental', 'downtempo', 'cut-up/dj', 'trip hop']

============================== file details ==============================
                                           'mtime'  1620568764.9602933  (2021-05-09 15:59:24)
                             'size'  9699274