======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '549'
                                          'artist'  'Billie Holiday'
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                                           'title'  'Fine and Mellow'
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                                      'lastfmtags'  "['vocal jazz', 'blues', 'jazz', 'female vocalists', 'jazz vocal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '18'
                                      'tracktotal'  '19'
                                            'date'  '2000'
                                        'comments'  ''
                                           'genre'  'prerock-jb-blues'
                                             'bpm'  '148'
                                             'key'  '5B'
                                        'acoustid'  'b05d529e-5c6e-4374-8312-378358e5a28f'
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     'Ken Burns Jazz: Definitive Billie Holiday'
'TBPM' (BPM (beats per minute))                     '148'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-blues'
'TDOR' (Original release time)                      '2000'
'TDRC' (Recording time)                             '2000-11-07'
'TIT2' (Title/songname/content description)         'Fine and Mellow'
'TKEY' (Initial key)                                '5B'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Billie Holiday'
'TPE2' (Band/orchestra/accompaniment)               'Billie Holiday'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Verve'
'TRCK' (Track number/Position in set)               '18/19'
'TSO2'                                              'Holiday, Billie'
'TSOP' (Performer sort order)                       'Holiday, Billie'
'TXXX:ASIN'                                         'B000050I3R'
'TXXX:Acoustid Id'                                  'b05d529e-5c6e-4374-8312-378358e5a28f'
'TXXX:Artists'                                      'Billie Holiday'
'TXXX:BARCODE'                                      '731454908122'
'TXXX:CATALOGNUMBER'                                '314 549 081-2'
'TXXX:MusicBrainz Album Artist Id'                  'd59c4cda-11d9-48db-8bfe-b557ee602aed'
'TXXX:MusicBrainz Album Id'                         '0ece900b-e872-41de-bf4b-f511c585e96d'
'TXXX:MusicBrainz Album Release Country'            'US'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album/compilation'
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'TXXX:MusicBrainz Release Group Id'                 'c1ed88dc-7400-3b98-8d32-33ec3b8b66e1'
'TXXX:MusicBrainz Release Track Id'                 '2ee4ae90-e7ac-3a73-b5b3-d535f38fb76e'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:lastfmtags'                                   ['vocal jazz', 'blues', 'jazz', 'female vocalists', 'jazz vocal']
'TXXX:originalyear'                                 '2000'
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+2.33 dB'
'TXXX:replaygain_track_peak'                        '0.497991'
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========================== row from database ==========================
                                              'id'  678111
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Billie Holiday/Ken Burns Jazz  The Definitive Billie Holiday/MBZ;#Billie Holiday;#Ken Burns Jazz The Definitive Billie Holiday;#18;#Fine and Mellow.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  549
                                           'genre'  prerock-jb-blues
                                        'filesize'  22039987
                                           'mtime'  1620402234
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country The MBZ;#Billie Holiday;#Ken The Holiday;#18;#Fine prerock jb blues
                                      'tag_artist'  Billie Holiday
                                     'tag_release'  Ken Burns Jazz: Definitive Billie Holiday
                                       'tag_title'  Fine and Mellow
                                             'bpm'  148.0
                                    'search_title'  'and':2 'fine':1 'mellow':3
                                   'search_artist'  'billie':1 'holiday':2
                                  'search_release'  'billie':6 'burns':2 'definitive':5 'holiday':7 'jazz':3,4 'ken':1
                                     'search_rest'  '18':15,18 'billie':7,9 'blues':22 'country':4 'exotica':2 'fine':16,19 'holiday':10,12,14,17 'jazz':1 'jb':21 'ken':11,13 'mbz':6,8 'oldies':3 'prerock':20 'the':5
                                    'search_combo'  '18':27,30 'and':2A 'billie':4B,11C,19,21 'blues':34 'burns':7C 'country':16 'definitive':10C 'exotica':14 'fine':1A,28,31 'holiday':5B,12C,22,24,26,29 'jazz':8C,9C,13 'jb':33 'ken':6C,23,25 'mbz':18,20 'mellow':3A 'oldies':15 'prerock':32 'the':17
                                    'tag_tracknum'  18
                                      'num_images'  1
                                             'key'  5B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-2', 'q-syn-1', 'q-chart-4', 'q-other-4', 'Q-HAP-2', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['vocal jazz', 'blues', 'jazz', 'female vocalists', 'jazz vocal']
                                        'tag_date'  2000
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620402233.645558  (2021-05-07 17:43:53)
                             'size'  22039987