======================== unified (from filesystem) ========================
                                         'bitrate'  '181.241'
                                        'duration'  '234'
                                          'artist'  'Billy Joel'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Allentown'
                                           'quals'  ("['Q-HAP-2', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-OLDST-3', "
 "'Q-HHRNBTT-1', 'Q-PLAY-2', 'q-syn-2', 'q-bass-2', 'q-busy-3', 'q-grit-2', "
 "'q-chart-4', 'q-drums-4', 'q-other-2', 'q-vocals-3', 'q-mixbeat-1', "
 "'Q-PIANO-2']")
                                      'lastfmtags'  "['rock', 'singer songwriter', 'piano', 'pop', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1980'
                                        'comments'  ''
                                           'genre'  'ifs-songwriter;set-pl-billboard'
                                             'bpm'  '114.092'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

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'TBPM' (BPM (beats per minute))                     '114.092'
'TCON' (Content type, a.k.a. Genre)                 ['ifs-songwriter', 'set-pl-billboard']
'TDRC' (Recording time)                             '1980'
'TIT2' (Title/songname/content description)         'Allentown'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Billy Joel'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['rock', 'singer songwriter', 'piano', 'pop', 'classic rock']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+0.01 dB'
'TXXX:replaygain_track_peak'                        '0.562389'

========================== row from database ==========================
                                              'id'  1256920
                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/Billy Joel_/Billy Joel - Allentown.mp3
                                         'working'  None
                                         'bitrate'  181
                                    'duration_sec'  234
                                           'genre'  ifs-songwriter;set-pl-billboard
                                        'filesize'  5308288
                                           'mtime'  1638554938
                                   'redo_metaread'  0
                                        'rest_str'   00singer songwriter eos Joel_ ifs songwriter;set pl billboard
                                      'tag_artist'  Billy Joel
                                     'tag_release'  None
                                       'tag_title'  Allentown
                                             'bpm'  114.092
                                    'search_title'  'allentown':1
                                   'search_artist'  'billy':1 'joel':2
                                  'search_release'  
                                     'search_rest'  '00singer':1 'billboard':11 'eos':3 'ifs':5 'joel':4 'pl':10 'set':7,9 'songwriter':2,6,8
                                    'search_combo'  '00singer':4 'allentown':1A 'billboard':14 'billy':2B 'eos':6 'ifs':8 'joel':3B,7 'pl':13 'set':10,12 'songwriter':5,9,11
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-2', '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-PLAY-2', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['rock', 'singer songwriter', 'piano', 'pop', 'classic rock']
                                        'tag_date'  1980
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1638554938.486602  (2021-12-03 19:08:58)
                             'size'  5308288