======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '279'
                                          'artist'  'Bob Dylan'
                                     'text_people'  ''
                                         'release'  "The Times They Are A-Changin'"
                                           'title'  'Boots Of Spanish Leather'
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                                      'lastfmtags'  "['folk rock', 'rock', 'classic rock', 'folk', 'singer songwriter']"
                                     'discogstags'  "['folk, world, & country', 'folk']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  ''
                                            'date'  '1964'
                                        'comments'  ''
                                           'genre'  'ifs-songwriter-folk'
                                             'bpm'  '137.478'
                                             'key'  '5A'
                                        'acoustid'  ''
rest: ''

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

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'TALB' (Album/Movie/Show title)                     "The Times They Are A-Changin'"
'TBPM' (BPM (beats per minute))                     '137.478'
'TCON' (Content type, a.k.a. Genre)                 'ifs-songwriter-folk'
'TDRC' (Recording time)                             '1964'
'TIT2' (Title/songname/content description)         'Boots Of Spanish Leather'
'TKEY' (Initial key)                                '5A'
'TPE1' (Lead performer(s)/Soloist(s))               'Bob Dylan'
'TRCK' (Track number/Position in set)               '7'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['folk, world, & country', 'folk']
'TXXX:lastfmtags'                                   ['folk rock', 'rock', 'classic rock', 'folk', 'singer songwriter']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.23 dB'
'TXXX:replaygain_track_peak'                        '0.517557'

========================== row from database ==========================
                                              'id'  1528261
                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/Bob Dylan/1964 - The Times They Are A-Changin_/07 Boots Of Spanish Leather.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  279
                                           'genre'  ifs-songwriter-folk
                                        'filesize'  6719158
                                           'mtime'  1636400721
                                   'redo_metaread'  0
                                        'rest_str'   00singer songwriter eos 1964 Changin_ 07 ifs songwriter folk
                                      'tag_artist'  Bob Dylan
                                     'tag_release'  The Times They Are A-Changin'
                                       'tag_title'  Boots Of Spanish Leather
                                             'bpm'  137.478
                                    'search_title'  'boots':1 'leather':4 'of':2 'spanish':3
                                   'search_artist'  'bob':1 'dylan':2
                                  'search_release'  'a':5 'achangin':7 'are':4 'changin':6 'the':1 'they':3 'times':2
                                     'search_rest'  '00singer':1 '1964':4 'changin':5 'eos':3 'folk':7 'ifs':6 'songwriter':2
                                    'search_combo'  '00singer':14 '1964':17 'a':11C 'achangin':13C 'are':10C 'bob':5B 'boots':1A 'changin':12C,18 'dylan':6B 'eos':16 'folk':20 'ifs':19 'leather':4A 'of':2A 'songwriter':15 'spanish':3A 'the':7C 'they':9C 'times':8C
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  5A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-2', 'q-chart-4', 'q-other-1', 'Q-HAP-2', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['folk rock', 'rock', 'classic rock', 'folk', 'singer songwriter']
                                        'tag_date'  1964
                                     'discogstags'  ['folk, world, & country', 'folk']

============================== file details ==============================
                                           'mtime'  1636400720.9112136  (2021-11-08 20:45:20)
                             'size'  6719158