======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '158'
                                          'artist'  'Wim Sonneveld'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Aan De Amsterdamse Grachten'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-HHRNBTT-1', 'Q-UNU-1', 'Q-OLDST-3', "
 "'Q-LOCALNESS-3', 'q-syn-1', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-1', "
 "'q-chart-2', 'q-drums-1', 'q-other-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['male vocalists', 'cabaret', 'singer songwriter', 'carnaval', 'dutch']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'loc-eur-netherlands'
                                             'bpm'  '124.0'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '124.0'
'TCON' (Content type, a.k.a. Genre)                 'loc-eur-netherlands'
'TIT2' (Title/songname/content description)         'Aan De Amsterdamse Grachten'
'TKEY' (Initial key)                                '9B'
'TPE1' (Lead performer(s)/Soloist(s))               'Wim Sonneveld'
'TXXX:Mp3gain_minmax'                               '081,183'
'TXXX:Mp3gain_undo'                                 '+002,+002,N'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['male vocalists', 'cabaret', 'singer songwriter', 'carnaval', 'dutch']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '1'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.57 dB'
'TXXX:replaygain_track_peak'                        '0.667154'

========================== row from database ==========================
                                              'id'  1334333
                                            'path'  /data/Music/Bulk/00spent/Cabaret/Wim Sonneveld/Wim Sonneveld - Aan De Amsterdamse Grachten.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  158
                                           'genre'  loc-eur-netherlands
                                        'filesize'  2531027
                                           'mtime'  1621630319
                                   'redo_metaread'  0
                                        'rest_str'   00spent Cabaret loc eur netherlands
                                      'tag_artist'  Wim Sonneveld
                                     'tag_release'  None
                                       'tag_title'  Aan De Amsterdamse Grachten
                                             'bpm'  124.0
                                    'search_title'  'aan':1 'amsterdamse':3 'de':2 'grachten':4
                                   'search_artist'  'sonneveld':2 'wim':1
                                  'search_release'  
                                     'search_rest'  '00spent':1 'cabaret':2 'eur':4 'loc':3 'netherlands':5
                                    'search_combo'  '00spent':7 'aan':1A 'amsterdamse':3A 'cabaret':8 'de':2A 'eur':10 'grachten':4A 'loc':9 'netherlands':11 'sonneveld':6B 'wim':5B
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-1', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-2', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['male vocalists', 'cabaret', 'singer songwriter', 'carnaval', 'dutch']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621630319.30513  (2021-05-21 22:51:59)
                             'size'  2531027