======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '173'
                                          'artist'  'Dock Boggs'
                                     'text_people'  ''
                                         'release'  'Classic Mountain Songs from Smithsonian Folkways (2002, Smithsonian Folkways)'
                                           'title'  'Sugar Baby'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-2', 'Q-LOCALNESS-3', 'Q-OLDST-1', 'Q-JZFKS-1', "
 "'Q-HHRNBTT-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['country', 'blues', 'banjo', 'americana', 'folk']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '02'
                                      'tracktotal'  ''
                                            'date'  '2002'
                                        'comments'  ''
                                           'genre'  'ifs-songwriter-folk;loc-namerica'
                                             'bpm'  '117.127'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Classic Mountain Songs from Smithsonian Folkways (2002, Smithsonian Folkways)'
'TBPM' (BPM (beats per minute))                     '117.127'
'TCON' (Content type, a.k.a. Genre)                 ['ifs-songwriter-folk', 'loc-namerica']
'TDRC' (Recording time)                             '2002'
'TIT2' (Title/songname/content description)         'Sugar Baby'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               'Dock Boggs'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists / Various Artists'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Smithsonian Folkways'
'TRCK' (Track number/Position in set)               '02'
'TXXX:ALBUMARTIST'                                  'Various Artists'
'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:lastfmtags'                                   ['country', 'blues', 'banjo', 'americana', 'folk']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'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'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.66 dB'
'TXXX:replaygain_track_peak'                        '0.690937'

========================== row from database ==========================
                                              'id'  476787
                                            'path'  /data/Music/Bulk/00localcharacter/VA. World 1： Trad/Classic Mountain Songs from Smithsonian Folkways (Smithsonian Folkways, 2002) [192k]/02 Sugar Baby.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  173
                                           'genre'  ifs-songwriter-folk;loc-namerica
                                        'filesize'  4177015
                                           'mtime'  1621629862
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter VA. World 1： Trad (Smithsonian Folkways, 2002) [192k] ifs songwriter folk;loc namerica
                                      'tag_artist'  Dock Boggs
                                     'tag_release'  Classic Mountain Songs from Smithsonian Folkways (2002, Smithsonian Folkways)
                                       'tag_title'  Sugar Baby
                                             'bpm'  117.127
                                    'search_title'  'baby':2 'sugar':1
                                   'search_artist'  'boggs':2 'dock':1
                                  'search_release'  '2002':7,8 'classic':1 'folkways':6,9 'from':4 'mountain':2 'smithsonian':5 'songs':3
                                     'search_rest'  '1':4,5,6 '192k':14,15 '2002':12,13 'folk':18,20 'folkways':10,11 'ifs':16 'loc':19,21 'namerica':22 'smithsonian':8,9 'songwriter':17 'trad':7 'va':1,2 'world':3
                                    'search_combo'  '1':17,18,19 '192k':27,28 '2002':11C,12C,25,26 'baby':2A 'boggs':4B 'classic':5C 'dock':3B 'folk':31,33 'folkways':10C,13C,23,24 'from':8C 'ifs':29 'loc':32,34 'mountain':6C 'namerica':35 'smithsonian':9C,21,22 'songs':7C 'songwriter':30 'sugar':1A 'trad':20 'va':14,15 'world':16
                                    'tag_tracknum'  2
                                      'num_images'  0
                                             'key'  1A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['country', 'blues', 'banjo', 'americana', 'folk']
                                        'tag_date'  2002
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621629862.4885035  (2021-05-21 22:44:22)
                             'size'  4177015