======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '168'
                                          'artist'  'Nirvana'
                                     'text_people'  ''
                                         'release'  'Bleach'
                                           'title'  'About a Girl'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-JZFKS-1', 'Q-LOCALNESS-1', "
 "'Q-OLDST-3', 'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-3', 'q-play-3', "
 "'q-chart-4', 'q-drums-4', 'q-other-2', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['alternative rock', '90s', 'alternative', 'grunge', 'rock']"
                                     'discogstags'  "['rock', 'grunge', 'alternative rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  '13'
                                            'date'  '2009'
                                        'comments'  ''
                                           'genre'  'rock-gr-grunge'
                                             'bpm'  '88.592'
                                             'key'  '10A'
                                        'acoustid'  '3cd0927d-caca-4704-bfa9-755595be792c'
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Bleach'
'TBPM' (BPM (beats per minute))                     '88.592'
'TCON' (Content type, a.k.a. Genre)                 'rock-gr-grunge'
'TDOR' (Original release time)                      '1989'
'TDRC' (Recording time)                             '2009-06-09'
'TIT2' (Title/songname/content description)         'About a Girl'
'TKEY' (Initial key)                                '10A'
'TLEN' (Length)                                     '168254'
'TMED' (Media type)                                 'SHM-CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Nirvana'
'TPE2' (Band/orchestra/accompaniment)               'Nirvana'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Sub Pop Records'
'TRCK' (Track number/Position in set)               '3/13'
'TSO2'                                              'Nirvana'
'TSOP' (Performer sort order)                       'Nirvana'
'TSRC' (ISRC (international standard recording code))  'USSUB0200002/USUG10200084'
'TXXX:Acoustid Id'                                  '3cd0927d-caca-4704-bfa9-755595be792c'
'TXXX:BARCODE'                                      '4943674085736'
'TXXX:CATALOGNUMBER'                                'WPCR-13269'
'TXXX:MusicBrainz Album Artist Id'                  '5b11f4ce-a62d-471e-81fc-a69a8278c7da'
'TXXX:MusicBrainz Album Id'                         'acfe96a7-e135-4183-8f24-f2cce6d872f1'
'TXXX:MusicBrainz Album Release Country'            'JP'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album'
'TXXX:MusicBrainz Artist Id'                        '5b11f4ce-a62d-471e-81fc-a69a8278c7da'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:discogstags'                                  ['rock', 'grunge', 'alternative rock']
'TXXX:lastfmtags'                                   ['alternative rock', '90s', 'alternative', 'grunge', 'rock']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '3'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '-1.41 dB'
'TXXX:replaygain_track_peak'                        '0.730613'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'b2e623ea-378b-4479-bb75-fa202aacbfc9')

========================== row from database ==========================
                                              'id'  1326055
                                            'path'  /data/Music/Bulk/00poprockelectronic/Nirvana/Bleach/Nirvana - About A Girl - 03.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  168
                                           'genre'  rock-gr-grunge
                                        'filesize'  2696200
                                           'mtime'  1623497851
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic 03 rock gr grunge
                                      'tag_artist'  Nirvana
                                     'tag_release'  Bleach
                                       'tag_title'  About a Girl
                                             'bpm'  88.592
                                    'search_title'  'a':2 'about':1 'girl':3
                                   'search_artist'  'nirvana':1
                                  'search_release'  'bleach':1
                                     'search_rest'  '00poprockelectronic':1 'gr':3 'grunge':4 'rock':2
                                    'search_combo'  '00poprockelectronic':6 'a':2A 'about':1A 'bleach':5C 'girl':3A 'gr':8 'grunge':9 'nirvana':4B 'rock':7
                                    'tag_tracknum'  3
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-2', 'q-chart-4', 'q-other-2', 'Q-HAP-3', 'q-bass-4', 'q-grit-3']
                                      'lastfmtags'  ['alternative rock', '90s', 'alternative', 'grunge', 'rock']
                                        'tag_date'  2009
                                     'discogstags'  ['rock', 'grunge', 'alternative rock']

============================== file details ==============================
                                           'mtime'  1623497851.4058628  (2021-06-12 13:37:31)
                             'size'  2696200