======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '174'
                                          'artist'  'Joe Loss'
                                     'text_people'  ''
                                         'release'  'Regal Zonophone MR 2434'
                                           'title'  "Let's Put Our Heads Together (vocal - Chick Henderson)"
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-3', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-4', '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'  '1937'
                                        'comments'  ''
                                           'genre'  'prerock-band'
                                             'bpm'  '88.670'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Regal Zonophone MR 2434'
'TBPM' (BPM (beats per minute))                     '88.670'
'TCON' (Content type, a.k.a. Genre)                 'prerock-band'
'TDRC' (Recording time)                             '1937'
'TIT2' (Title/songname/content description)         "Let's Put Our Heads Together (vocal - Chick Henderson)"
'TKEY' (Initial key)                                '6A'
'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'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'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'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.33 dB'
'TXXX:replaygain_track_peak'                        '0.563203'

========================== row from database ==========================
                                              'id'  1515671
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1937/Joe Loss - Let_s Put Our Heads Together (vocal - Chick Henderson) 1-4-1937.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  174
                                           'genre'  prerock-band
                                        'filesize'  3483442
                                           'mtime'  1620560564
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1937 Let_s 1 1937 prerock band
                                      'tag_artist'  Joe Loss
                                     'tag_release'  Regal Zonophone MR 2434
                                       'tag_title'  Let's Put Our Heads Together (vocal - Chick Henderson)
                                             'bpm'  88.67
                                    'search_title'  'chick':10 'heads':6 'henderson':11,12 'let':1 'lets':3 'our':5 'put':4 's':2 'together':7 'vocal':8,9
                                   'search_artist'  'joe':1 'loss':2
                                  'search_release'  '2434':4 'mr':3 'regal':1 'zonophone':2
                                     'search_rest'  '00oldiepop':5 '1':9 '1937':6 'band':11 'country':4 'exotica':2 'jazz':1 'let':7 'oldies':3 'prerock':10 's':8
                                    'search_combo'  '00oldiepop':23 '1':27 '1937':24 '2434':18C 'band':29 'chick':10A 'country':22 'exotica':20 'heads':6A 'henderson':11A,12A 'jazz':19 'joe':13B 'let':1A,25 'lets':3A 'loss':14B 'mr':17C 'oldies':21 'our':5A 'prerock':28 'put':4A 'regal':15C 's':2A,26 'together':7A 'vocal':8A,9A 'zonophone':16C
                                    '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-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-4', 'Q-HAP-3', 'q-bass-3', 'q-grit-1']
                                      'lastfmtags'  ['all', 'jazz', 'big band swing', 'wartime', 'swing']
                                        'tag_date'  1937
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620560563.8583739  (2021-05-09 13:42:43)
                             'size'  3483442