======================== unified (from filesystem) ========================
                                         'bitrate'  '112.0'
                                        'duration'  '171'
                                          'artist'  'Jeannette MacDonald & Nelson Eddy'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Merry Widow Waltz'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-OLDST-1', 'Q-LOCALNESS-1', "
 "'Q-HHRNBTT-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1935'
                                        'comments'  ''
                                           'genre'  'prerock-vocal'
                                             'bpm'  '137.199'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'PRIV:AverageLevel:u\x1a\x00\x00'                   PRIV(owner='AverageLevel', data=b'u\x1a\x00\x00')
'PRIV:PeakValue:ÿ\x7f\x00\x00'                      PRIV(owner='PeakValue', data=b'\xff\x7f\x00\x00')
'PRIV:WM/MediaClassPrimaryID:¼}`Ñ#ãâK\x86¡H¤*(D\x1e'  PRIV(owner='WM/MediaClassPrimaryID', data=b'\xbc}`\xd1#\xe3\xe2K\x86\xa1H\xa4*(D\x1e')
'PRIV:WM/MediaClassSecondaryID:\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'  PRIV(owner='WM/MediaClassSecondaryID', data=b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
'TBPM' (BPM (beats per minute))                     '137.199'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal'
'TDRC' (Recording time)                             '1935'
'TIT2' (Title/songname/content description)         'Merry Widow Waltz'
'TKEY' (Initial key)                                '9B'
'TLEN' (Length)                                     '171626'
'TPE1' (Lead performer(s)/Soloist(s))               'Jeannette MacDonald & Nelson Eddy'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.55 dB'
'TXXX:replaygain_track_peak'                        '0.354442'

========================== row from database ==========================
                                              'id'  1523708
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/30_s collection/nelson eddy, jeanette macdonald - merry widow waltz.mp3
                                         'working'  None
                                         'bitrate'  112
                                    'duration_sec'  171
                                           'genre'  prerock-vocal
                                        'filesize'  2426880
                                           'mtime'  1621853368
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 30_s collection nelson eddy, jeanette macdonald merry widow waltz prerock vocal
                                      'tag_artist'  Jeannette MacDonald & Nelson Eddy
                                     'tag_release'  None
                                       'tag_title'  Merry Widow Waltz
                                             'bpm'  137.199
                                    'search_title'  'merry':1 'waltz':3 'widow':2
                                   'search_artist'  'donald':6 'eddy':4 'jeannette':1 'mac':5 'macdonald':2 'nelson':3
                                  'search_release'  
                                     'search_rest'  '30':5 'collection':7 'country':4 'eddy':9,10 'exotica':2 'jazz':1 'jeanette':11 'macdonald':12 'merry':13 'nelson':8 'oldies':3 'prerock':16 's':6 'vocal':17 'waltz':15 'widow':14
                                    'search_combo'  '30':14 'collection':16 'country':13 'donald':9B 'eddy':7B,18,19 'exotica':11 'jazz':10 'jeanette':20 'jeannette':4B 'mac':8B 'macdonald':5B,21 'merry':1A,22 'nelson':6B,17 'oldies':12 'prerock':25 's':15 'vocal':26 'waltz':3A,24 'widow':2A,23
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1935
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621853367.683744  (2021-05-24 12:49:27)
                             'size'  2426880