======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '202'
                                          'artist'  'Fyodor Chaliapin'
                                     'text_people'  ''
                                         'release'  '20s and 30s popular'
                                           'title'  'Song Of The Volga Boatmen'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-3', 'q-busy-2', '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'  '1927'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '84.000'
                                             'key'  '7A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     '20s and 30s popular'
'TBPM' (BPM (beats per minute))                     '84.000'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1927'
'TIT2' (Title/songname/content description)         'Song Of The Volga Boatmen'
'TKEY' (Initial key)                                '7A'
'TLEN' (Length)                                     '202486'
'TPE1' (Lead performer(s)/Soloist(s))               'Fyodor Chaliapin'
'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'                                       '3'
'TXXX:q-busy'                                       '2'
'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'                        '+2.58 dB'
'TXXX:replaygain_track_peak'                        '0.502566'

========================== row from database ==========================
                                              'id'  1146906
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1920s and 1930s popular/Fyodor Chaliapin - Song Of The Volga Boatmen 1927.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  202
                                           'genre'  prerock-unsorted
                                        'filesize'  3368177
                                           'mtime'  1621697861
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1920s 1930s 1927 prerock unsorted
                                      'tag_artist'  Fyodor Chaliapin
                                     'tag_release'  20s and 30s popular
                                       'tag_title'  Song Of The Volga Boatmen
                                             'bpm'  84.0
                                    'search_title'  'boatmen':5 'of':2 'song':1 'the':3 'volga':4
                                   'search_artist'  'chaliapin':2 'fyodor':1
                                  'search_release'  '20s':1 '30s':3 'and':2 'popular':4
                                     'search_rest'  '00oldiepop':5 '1920s':6 '1927':8 '1930s':7 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':9 'unsorted':10
                                    'search_combo'  '00oldiepop':16 '1920s':17 '1927':19 '1930s':18 '20s':8C '30s':10C 'and':9C 'boatmen':5A 'chaliapin':7B 'country':15 'exotica':13 'fyodor':6B 'jazz':12 'of':2A 'oldies':14 'popular':11C 'prerock':20 'song':1A 'the':3A 'unsorted':21 'volga':4A
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  7A
                                           '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-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-3', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1927
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621697860.771233  (2021-05-22 17:37:40)
                             'size'  3368177