======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '167'
                                          'artist'  'Al Bowlly & Ray Noble '
                                     'text_people'  ''
                                         'release'  'HMV B-6514, Matrix OEA-819-2'
                                           'title'  'Sing As We Go (Parr/Davies) (30-8-1934)'
                                           '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-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['jazz', '30s', 'oldies', 'crooner', 'british']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '00'
                                      'tracktotal'  ''
                                            'date'  '1935'
                                        'comments'  ''
                                           'genre'  'prerock-vocal'
                                             'bpm'  '131.841'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'HMV B-6514, Matrix OEA-819-2'
'TBPM' (BPM (beats per minute))                     '131.841'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal'
'TDRC' (Recording time)                             '1935'
'TIT2' (Title/songname/content description)         'Sing As We Go (Parr/Davies) (30-8-1934)'
'TKEY' (Initial key)                                '6A'
'TLEN' (Length)                                     '167262'
'TPE1' (Lead performer(s)/Soloist(s))               'Al Bowlly & Ray Noble '
'TRCK' (Track number/Position in set)               '00'
'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:lastfmtags'                                   ['jazz', '30s', 'oldies', 'crooner', 'british']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '+1.55 dB'
'TXXX:replaygain_track_peak'                        '0.693530'

========================== row from database ==========================
                                              'id'  1130463
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1920s and 1930s popular/Al Bowlly, Ray Noble - Sing as we Go (1934).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  167
                                           'genre'  prerock-vocal
                                        'filesize'  2679365
                                           'mtime'  1620666342
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1920s and 1930s popular Bowlly, as we (1934) prerock vocal
                                      'tag_artist'  Al Bowlly & Ray Noble 
                                     'tag_release'  HMV B-6514, Matrix OEA-819-2
                                       'tag_title'  Sing As We Go (Parr/Davies) (30-8-1934)
                                             'bpm'  131.841
                                    'search_title'  '1934':10 '30':8 '3081934':11 '8':9 'as':2 'davies':6 'go':4 'parr':5 'parrdavies':7 'sing':1 'we':3
                                   'search_artist'  'al':1 'bowlly':2 'noble':4 'ray':3
                                  'search_release'  '2':8 '6514':3 '819':7 'b':2 'b6514':4 'hmv':1 'matrix':5 'oea':6 'oea8192':9
                                     'search_rest'  '00oldiepop':5 '1920s':6 '1930s':8 '1934':14,15 'and':7 'as':12 'bowlly':10,11 'country':4 'exotica':2 'jazz':1 'oldies':3 'popular':9 'prerock':16 'vocal':17 'we':13
                                    'search_combo'  '00oldiepop':29 '1920s':30 '1930s':32 '1934':10A,38,39 '2':23C '30':8A '3081934':11A '6514':18C '8':9A '819':22C 'al':12B 'and':31 'as':2A,36 'b':17C 'b6514':19C 'bowlly':13B,34,35 'country':28 'davies':6A 'exotica':26 'go':4A 'hmv':16C 'jazz':25 'matrix':20C 'noble':15B 'oea':21C 'oea8192':24C 'oldies':27 'parr':5A 'parrdavies':7A 'popular':33 'prerock':40 'ray':14B 'sing':1A 'vocal':41 'we':3A,37
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', '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-4', 'Q-HAP-3', 'q-bass-3', 'q-grit-1']
                                      'lastfmtags'  ['jazz', '30s', 'oldies', 'crooner', 'british']
                                        'tag_date'  1935
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620666341.6679046  (2021-05-10 19:05:41)
                             'size'  2679365