======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '148'
                                          'artist'  'Bert Ambrose'
                                     'text_people'  ''
                                         'release'  'Decca F 7107'
                                           'title'  "Ain't Cha Comin' Out (vocal - Evelyn Dall)"
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-JZFKS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-4', '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'  '["20\'s", \'british dance band\', \'retro\', \'swing\']'
                                     'discogstags'  "['jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1939'
                                        'comments'  ''
                                           'genre'  'prerock-swing'
                                             'bpm'  '143.925'
                                             'key'  '7A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Decca F 7107'
'TBPM' (BPM (beats per minute))                     '143.925'
'TCON' (Content type, a.k.a. Genre)                 'prerock-swing'
'TDRC' (Recording time)                             '1939'
'TIT2' (Title/songname/content description)         "Ain't Cha Comin' Out (vocal - Evelyn Dall)"
'TKEY' (Initial key)                                '7A'
'TPE1' (Lead performer(s)/Soloist(s))               'Bert Ambrose'
'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'                                   ["20's", 'british dance band', 'retro', 'swing']
'TXXX:q-bass'                                       '4'
'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'                        '+0.36 dB'
'TXXX:replaygain_track_peak'                        '0.547378'

========================== row from database ==========================
                                              'id'  1516665
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1939/Bert Ambrose - Ain_t Cha Comin_ Out (vocal - Evelyn Dall) 17-6-1939.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  148
                                           'genre'  prerock-swing
                                        'filesize'  2975538
                                           'mtime'  1620561386
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1939 Ain_t Comin_ 17 6 1939 prerock swing
                                      'tag_artist'  Bert Ambrose
                                     'tag_release'  Decca F 7107
                                       'tag_title'  Ain't Cha Comin' Out (vocal - Evelyn Dall)
                                             'bpm'  143.925
                                    'search_title'  'ain':1 'aint':3 'cha':4 'comin':5,6 'dall':11,12 'evelyn':10 'out':7 't':2 'vocal':8,9
                                   'search_artist'  'ambrose':2 'bert':1
                                  'search_release'  '7107':3 'decca':1 'f':2
                                     'search_rest'  '00oldiepop':5 '1939':6 '6':10 'ain':7 'comin':9 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':11 'swing':12 't':8
                                    'search_combo'  '00oldiepop':22 '1939':23 '6':27 '7107':17C 'ain':1A,24 'aint':3A 'ambrose':14B 'bert':13B 'cha':4A 'comin':5A,6A,26 'country':21 'dall':11A,12A 'decca':15C 'evelyn':10A 'exotica':19 'f':16C 'jazz':18 'oldies':20 'out':7A 'prerock':28 'swing':29 't':2A,25 'vocal':8A,9A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  7A
                                           '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-4', 'q-grit-1']
                                      'lastfmtags'  ["20's", 'british dance band', 'retro', 'swing']
                                        'tag_date'  1939
                                     'discogstags'  ['jazz']

============================== file details ==============================
                                           'mtime'  1620561385.7640157  (2021-05-09 13:56:25)
                             'size'  2975538