======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '177'
                                          'artist'  'Joe Loss'
                                     'text_people'  ''
                                         'release'  'HMV BD-5608'
                                           'title'  'Nightingale Sang In Berkeley Square (vocal - Paula Green)'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-4', 'q-busy-3', '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'  "['all', 'jazz', 'big band swing', 'wartime', 'swing']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1940'
                                        'comments'  ''
                                           'genre'  'prerock-band'
                                             'bpm'  '117.127'
                                             'key'  '2A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'HMV BD-5608'
'TBPM' (BPM (beats per minute))                     '117.127'
'TCON' (Content type, a.k.a. Genre)                 'prerock-band'
'TDRC' (Recording time)                             '1940'
'TIT2' (Title/songname/content description)         'Nightingale Sang In Berkeley Square (vocal - Paula Green)'
'TKEY' (Initial key)                                '2A'
'TPE1' (Lead performer(s)/Soloist(s))               'Joe Loss'
'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'                                   ['all', 'jazz', 'big band swing', 'wartime', 'swing']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'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'                        '+0.50 dB'
'TXXX:replaygain_track_peak'                        '0.657048'

========================== row from database ==========================
                                              'id'  1450272
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1940/Joe Loss - Nightingale Sang In Berkeley Square (vocal - Paula Green) 17-7-1940.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  177
                                           'genre'  prerock-band
                                        'filesize'  3546930
                                           'mtime'  1620560822
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1940 17 7 1940 prerock band
                                      'tag_artist'  Joe Loss
                                     'tag_release'  HMV BD-5608
                                       'tag_title'  Nightingale Sang In Berkeley Square (vocal - Paula Green)
                                             'bpm'  117.127
                                    'search_title'  'berkeley':4 'green':9,10 'in':3 'nightingale':1 'paula':8 'sang':2 'square':5 'vocal':6,7
                                   'search_artist'  'joe':1 'loss':2
                                  'search_release'  '5608':3 'bd':2 'bd5608':4 'hmv':1
                                     'search_rest'  '00oldiepop':5 '1940':6 '7':7 'band':9 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':8
                                    'search_combo'  '00oldiepop':21 '1940':22 '5608':15C '7':23 'band':25 'bd':14C 'bd5608':16C 'berkeley':4A 'country':20 'exotica':18 'green':9A,10A 'hmv':13C 'in':3A 'jazz':17 'joe':11B 'loss':12B 'nightingale':1A 'oldies':19 'paula':8A 'prerock':24 'sang':2A 'square':5A 'vocal':6A,7A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  2A
                                           '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-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-1']
                                      'lastfmtags'  ['all', 'jazz', 'big band swing', 'wartime', 'swing']
                                        'tag_date'  1940
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620560821.5914447  (2021-05-09 13:47:01)
                             'size'  3546930