======================== unified (from filesystem) ========================
                                         'bitrate'  '256.0'
                                        'duration'  '166'
                                          'artist'  'The Carter Family'
                                     'text_people'  ''
                                         'release'  'In the Shadow of Clinch Mountain'
                                           'title'  'When the Springtime Comes Again'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-2', 'Q-HHRNBTT-1', 'Q-LOCALNESS-3', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-2', "
 "'q-chart-3', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['30s', 'americana', 'country', 'bluegrass', 'folk', 'old timey']"
                                     'discogstags'  "['folk, world, & country']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '47'
                                      'tracktotal'  ''
                                            'date'  '2000'
                                        'comments'  ''
                                           'genre'  'loc-namerica-country-bluegrass'
                                             'bpm'  '97.4'
                                             'key'  '11A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:iTunNORM:eng'                                 (' 000000F1 000000F1 00000497 00000497 000186E5 000186E5 00004A23 00004A16 '
 '000186E5 000186E5')
'TALB' (Album/Movie/Show title)                     'In the Shadow of Clinch Mountain'
'TBPM' (BPM (beats per minute))                     '97.4'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country-bluegrass'
'TDRC' (Recording time)                             '2000'
'TIT2' (Title/songname/content description)         'When the Springtime Comes Again'
'TKEY' (Initial key)                                '11A'
'TPE1' (Lead performer(s)/Soloist(s))               'The Carter Family'
'TPE2' (Band/orchestra/accompaniment)               'The Carter Family'
'TPUB' (Publisher)                                  'Bear Family Records'
'TRCK' (Track number/Position in set)               '47'
'TSSE' (Software/Hardware and settings used for encoding)  'Lame3.92'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '2'
'TXXX:discogstags'                                  'folk, world, & country'
'TXXX:lastfmtags'                                   ['30s', 'americana', 'country', 'bluegrass', 'folk', 'old timey']
'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-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.84 dB'
'TXXX:replaygain_track_peak'                        '0.585471'

========================== row from database ==========================
                                              'id'  728261
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/In the Shadow of Clinch Mountain/47 When the Springtime Comes Again.mp3
                                         'working'  None
                                         'bitrate'  256
                                    'duration_sec'  166
                                           'genre'  loc-namerica-country-bluegrass
                                        'filesize'  5373208
                                           'mtime'  1621628640
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm 47 loc namerica country bluegrass
                                      'tag_artist'  The Carter Family
                                     'tag_release'  In the Shadow of Clinch Mountain
                                       'tag_title'  When the Springtime Comes Again
                                             'bpm'  97.4
                                    'search_title'  'again':5 'comes':4 'springtime':3 'the':2 'when':1
                                   'search_artist'  'carter':2 'family':3 'the':1
                                  'search_release'  'clinch':5 'in':1 'mountain':6 'of':4 'shadow':3 'the':2
                                     'search_rest'  '47':1 'bluegrass':5 'country':4 'loc':2 'namerica':3
                                    'search_combo'  '47':15 'again':5A 'bluegrass':19 'carter':7B 'clinch':13C 'comes':4A 'country':18 'family':8B 'in':9C 'loc':16 'mountain':14C 'namerica':17 'of':12C 'shadow':11C 'springtime':3A 'the':2A,6B,10C 'when':1A
                                    'tag_tracknum'  47
                                      'num_images'  1
                                             'key'  11A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['30s', 'americana', 'country', 'bluegrass', 'folk', 'old timey']
                                        'tag_date'  2000
                                     'discogstags'  ['folk, world, & country']

============================== file details ==============================
                                           'mtime'  1621628639.612778  (2021-05-21 22:23:59)
                             'size'  5373208