======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '179'
                                          'artist'  'Billy Cotton'
                                     'text_people'  ''
                                         'release'  'Regal Zonophone MR 2208'
                                           'title'  'Serenade In The Night (Un Violon Dans La Nuit) (vocal - Alan Breeze)'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-JZFKS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-2', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['jazz', '40s', 'wartime', 'swing']"
                                     'discogstags'  "['jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1936'
                                        'comments'  ''
                                           'genre'  'prerock-swing'
                                             'bpm'  '102.333'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Regal Zonophone MR 2208'
'TBPM' (BPM (beats per minute))                     '102.333'
'TCON' (Content type, a.k.a. Genre)                 'prerock-swing'
'TDRC' (Recording time)                             '1936'
'TIT2' (Title/songname/content description)         'Serenade In The Night (Un Violon Dans La Nuit) (vocal - Alan Breeze)'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Billy Cotton'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'jazz'
'TXXX:lastfmtags'                                   ['jazz', '40s', 'wartime', 'swing']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'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'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.50 dB'
'TXXX:replaygain_track_peak'                        '0.551920'

========================== row from database ==========================
                                              'id'  1448218
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1936/Billy Cotton - Serenade In The Night (Un Violon Dans La Nuit) (vocal - Alan Breeze) 29-9-1936.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  179
                                           'genre'  prerock-swing
                                        'filesize'  3589938
                                           'mtime'  1620560822
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1936 29 9 1936 prerock swing
                                      'tag_artist'  Billy Cotton
                                     'tag_release'  Regal Zonophone MR 2208
                                       'tag_title'  Serenade In The Night (Un Violon Dans La Nuit) (vocal - Alan Breeze)
                                             'bpm'  102.333
                                    'search_title'  'alan':14 'breeze':15,16 'dans':8 'in':2 'la':9 'night':4 'nuit':10,11 'serenade':1 'the':3 'un':5,6 'violon':7 'vocal':12,13
                                   'search_artist'  'billy':1 'cotton':2
                                  'search_release'  '2208':4 'mr':3 'regal':1 'zonophone':2
                                     'search_rest'  '00oldiepop':5 '1936':6 '29':7 '9':8 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':9 'swing':10
                                    'search_combo'  '00oldiepop':27 '1936':28 '2208':22C '29':29 '9':30 'alan':14A 'billy':17B 'breeze':15A,16A 'cotton':18B 'country':26 'dans':8A 'exotica':24 'in':2A 'jazz':23 'la':9A 'mr':21C 'night':4A 'nuit':10A,11A 'oldies':25 'prerock':31 'regal':19C 'serenade':1A 'swing':32 'the':3A 'un':5A,6A 'violon':7A 'vocal':12A,13A 'zonophone':20C
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-2', 'q-grit-1']
                                      'lastfmtags'  ['jazz', '40s', 'wartime', 'swing']
                                        'tag_date'  1936
                                     'discogstags'  ['jazz']

============================== file details ==============================
                                           'mtime'  1620560821.7413175  (2021-05-09 13:47:01)
                             'size'  3589938