======================== unified (from filesystem) ========================
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                                        'duration'  '173'
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                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
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                                      'tracktotal'  '13'
                                            'date'  '1990'
                                        'comments'  ''
                                           'genre'  'ifs-songwriter-eos;set-pl-sced'
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                                             'key'  '6B'
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rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:iTunNORM:eng'                                 (' 00000269 000002AF 0000143F 00001760 0002230E 0002230E 000052E0 00005476 '
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'TBPM' (BPM (beats per minute))                     '156'
'TCON' (Content type, a.k.a. Genre)                 ['ifs-songwriter-eos', 'set-pl-sced']
'TDOR' (Original release time)                      '1970'
'TDRC' (Recording time)                             '1990'
'TIT2' (Title/songname/content description)         'Hang Onto Yourself'
'TKEY' (Initial key)                                '6B'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Arnold Corns'
'TPE2' (Band/orchestra/accompaniment)               'David Bowie'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Rykodisc'
'TRCK' (Track number/Position in set)               '13/13'
'TSO2'                                              'Bowie, David'
'TSOP' (Performer sort order)                       'Arnold Corns, The'
'TSRC' (ISRC (international standard recording code))  'USJT10200004'
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'TXXX:Artists'                                      'Arnold Corns'
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'TXXX:MusicBrainz Album Id'                         '246a9545-4a25-3204-a817-e52f9e5ae730'
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'TXXX:MusicBrainz Artist Id'                        '1e18f529-2965-494e-be50-4b2a023148d4'
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'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:discogstags'                                  ['glam', 'blues rock', 'alternative rock', 'rock']
'TXXX:lastfmtags'                                   ['classic rock', '80s', 'alternative', 'rock', 'glam rock']
'TXXX:originalyear'                                 '1970'
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '2'
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'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.15 dB'
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========================== row from database ==========================
                                              'id'  334875
                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/David Bowie/[1971] The Man Who Sold The World/13 Hang Onto Yourself.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  173
                                           'genre'  ifs-songwriter-eos;set-pl-sced
                                        'filesize'  2865863
                                           'mtime'  1636400843
                                   'redo_metaread'  0
                                        'rest_str'   00singer songwriter eos [1971] 13 ifs songwriter eos;set pl sced
                                      'tag_artist'  David Bowie
                                     'tag_release'  The Man Who Sold the World
                                       'tag_title'  Hang Onto Yourself
                                             'bpm'  156.0
                                    'search_title'  'hang':1 'onto':2 'yourself':3
                                   'search_artist'  'bowie':2 'david':1
                                  'search_release'  'man':2 'sold':4 'the':1 'who':3 'world':5
                                     'search_rest'  '00singer':1 '1971':4,5 'eos':3,7,9 'ifs':6 'pl':11 'sced':12 'set':8,10 'songwriter':2
                                    'search_combo'  '00singer':11 '1971':14,15 'bowie':5B 'david':4B 'eos':13,17,19 'hang':1A 'ifs':16 'man':7C 'onto':2A 'pl':21 'sced':22 'set':18,20 'sold':9C 'songwriter':12 'the':6C 'who':8C 'world':10C 'yourself':3A
                                    'tag_tracknum'  13
                                      'num_images'  1
                                             'key'  6B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', '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-2', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['classic rock', '80s', 'alternative', 'rock', 'glam rock']
                                        'tag_date'  1990
                                     'discogstags'  ['glam', 'blues rock', 'alternative rock', 'rock']

============================== file details ==============================
                                           'mtime'  1636400843.1973543  (2021-11-08 20:47:23)
                             'size'  2865863