======================== unified (from filesystem) ========================
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                                        'duration'  '403'
                                          'artist'  'BT'
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                                      'lastfmtags'  "['electronica', 'trance', 'techno', 'electronic', 'dance']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
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                                     'tracknumber'  '7'
                                      'tracktotal'  '11'
                                            'date'  '1999'
                                        'comments'  ''
                                           'genre'  'electronic-generic or radio-dance'
                                             'bpm'  '138'
                                             'key'  '2A'
                                        'acoustid'  '82ddd2e0-c7c4-47e6-89b4-afec37cd2b60'
rest: ''

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

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'TBPM' (BPM (beats per minute))                     '138'
'TCON' (Content type, a.k.a. Genre)                 'electronic-generic or radio-dance'
'TDOR' (Original release time)                      '1999'
'TDRC' (Recording time)                             '1999'
'TENC' (Encoded by)                                 'iTunes v6.0.5'
'TIT2' (Title/songname/content description)         'Giving Up the Ghost'
'TKEY' (Initial key)                                '2A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'BT'
'TPE2' (Band/orchestra/accompaniment)               'BT'
'TPOS' (Part of a set)                              '1/2'
'TPUB' (Publisher)                                  'Polydor'
'TRCK' (Track number/Position in set)               '7/11'
'TSO2'                                              'BT'
'TSOP' (Performer sort order)                       'BT'
'TSRC' (ISRC (international standard recording code))  'NLE711006087'
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'TXXX:Acoustid Id'                                  '82ddd2e0-c7c4-47e6-89b4-afec37cd2b60'
'TXXX:Artists'                                      'BT'
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'TXXX:MusicBrainz Album Id'                         '81634b64-a1b6-3719-b915-08d6c0dd1144'
'TXXX:MusicBrainz Album Release Country'            'JP'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album'
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'TXXX:MusicBrainz Release Group Id'                 'b0660065-6945-3201-b208-619ac856ac9a'
'TXXX:MusicBrainz Release Track Id'                 'a4fe3814-e9a0-38f9-a1d9-ad0d60f1bace'
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'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
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'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:lastfmtags'                                   ['electronica', 'trance', 'techno', 'electronic', 'dance']
'TXXX:originalyear'                                 '1999'
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
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'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '3'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-0.88 dB'
'TXXX:replaygain_track_peak'                        '0.515715'
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========================== row from database ==========================
                                              'id'  1321241
                                            'path'  /data/Music/Bulk/00poprockelectronic/BT/Movement in Still Life/07 Giving Up The Ghost.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  403
                                           'genre'  electronic-generic or radio-dance
                                        'filesize'  9715509
                                           'mtime'  1621696107
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic 07 The electronic generic or radio dance
                                      'tag_artist'  BT
                                     'tag_release'  Movement in Still Life
                                       'tag_title'  Giving Up the Ghost
                                             'bpm'  138.0
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                                   'search_artist'  'bt':1
                                  'search_release'  'in':2 'life':4 'movement':1 'still':3
                                     'search_rest'  '00poprockelectronic':1 'dance':7 'electronic':3 'generic':4 'or':5 'radio':6 'the':2
                                    'search_combo'  '00poprockelectronic':10 'bt':5B 'dance':16 'electronic':12 'generic':13 'ghost':4A 'giving':1A 'in':7C 'life':9C 'movement':6C 'or':14 'radio':15 'still':8C 'the':3A,11 'up':2A
                                    'tag_tracknum'  7
                                      'num_images'  1
                                             'key'  2A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-3', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-3', 'q-chart-3', 'q-other-2', 'Q-HAP-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['electronica', 'trance', 'techno', 'electronic', 'dance']
                                        'tag_date'  1999
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621696106.5241709  (2021-05-22 17:08:26)
                             'size'  9715509