======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '164'
                                          'artist'  'M. Ward'
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                                           'title'  'For Beginners'
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                                      'lastfmtags'  "['indie', 'singer songwritergdchill', 'faves', 'folk', 'good stuff']"
                                     'discogstags'  "['rock', 'indie rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
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                                      'tracktotal'  ''
                                            'date'  '2009'
                                        'comments'  ''
                                           'genre'  'ifs-songwriter-indie'
                                             'bpm'  '118.152'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

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'TALB' (Album/Movie/Show title)                     'Hold Time'
'TBPM' (BPM (beats per minute))                     '118.152'
'TCON' (Content type, a.k.a. Genre)                 'ifs-songwriter-indie'
'TDRC' (Recording time)                             '2009'
'TIT2' (Title/songname/content description)         'For Beginners'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'M. Ward'
'TPE2' (Band/orchestra/accompaniment)               'M. Ward'
'TPUB' (Publisher)                                  'Merge Records'
'TRCK' (Track number/Position in set)               '01'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['rock', 'indie rock']
'TXXX:lastfmtags'                                   ['indie', 'singer songwritergdchill', 'faves', 'folk', 'good stuff']
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'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '-1.79 dB'
'TXXX:replaygain_track_peak'                        '0.582985'

========================== row from database ==========================
                                              'id'  1263837
                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/M. Ward/Hold Time/01 m. ward - for beginners.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  164
                                           'genre'  ifs-songwriter-indie
                                        'filesize'  4038658
                                           'mtime'  1636400466
                                   'redo_metaread'  0
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                                     'tag_release'  Hold Time
                                       'tag_title'  For Beginners
                                             'bpm'  118.152
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                                   'search_artist'  'm':1,2 'ward':3
                                  'search_release'  'hold':1 'time':2
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                                    'tag_tracknum'  1
                                      'num_images'  1
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-3', 'q-other-4', 'Q-HAP-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['indie', 'singer songwritergdchill', 'faves', 'folk', 'good stuff']
                                        'tag_date'  2009
                                     'discogstags'  ['rock', 'indie rock']

============================== file details ==============================
                                           'mtime'  1636400465.757054  (2021-11-08 20:41:05)
                             'size'  4038658