======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '184'
                                          'artist'  'Ray Noble & His All Star American Orchestra'
                                     'text_people'  ''
                                         'release'  '20s and 30s popular'
                                           'title'  "Let's Call a Heart a Heart"
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-2', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1935'
                                        'comments'  ''
                                           'genre'  'prerock-swing'
                                             'bpm'  '145.685'
                                             'key'  '6B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     '20s and 30s popular'
'TBPM' (BPM (beats per minute))                     '145.685'
'TCON' (Content type, a.k.a. Genre)                 'prerock-swing'
'TDRC' (Recording time)                             '1935'
'TIT2' (Title/songname/content description)         "Let's Call a Heart a Heart"
'TKEY' (Initial key)                                '6B'
'TLEN' (Length)                                     '184222'
'TPE1' (Lead performer(s)/Soloist(s))               'Ray Noble & His All Star American Orchestra'
'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:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'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'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.79 dB'
'TXXX:replaygain_track_peak'                        '0.448752'

========================== row from database ==========================
                                              'id'  1514077
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1920s and 1930s popular/Ray Noble - Let_s Call A Heart A Heart.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  184
                                           'genre'  prerock-swing
                                        'filesize'  2949120
                                           'mtime'  1620559717
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1920s 1930s Let_s prerock swing
                                      'tag_artist'  Ray Noble & His All Star American Orchestra
                                     'tag_release'  20s and 30s popular
                                       'tag_title'  Let's Call a Heart a Heart
                                             'bpm'  145.685
                                    'search_title'  'a':5 'call':4 'heart':6 'let':1 'lets':3 's':2
                                   'search_artist'  'all':4 'american':6 'his':3 'noble':2 'orchestra':7 'ray':1 'star':5
                                  'search_release'  '20s':1 '30s':3 'and':2 'popular':4
                                     'search_rest'  '00oldiepop':5 '1920s':6 '1930s':7 'country':4 'exotica':2 'jazz':1 'let':8 'oldies':3 'prerock':10 's':9 'swing':11
                                    'search_combo'  '00oldiepop':22 '1920s':23 '1930s':24 '20s':14C '30s':16C 'a':5A 'all':10B 'american':12B 'and':15C 'call':4A 'country':21 'exotica':19 'heart':6A 'his':9B 'jazz':18 'let':1A,25 'lets':3A 'noble':8B 'oldies':20 'orchestra':13B 'popular':17C 'prerock':27 'ray':7B 's':2A,26 'star':11B 'swing':28
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', '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-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1935
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620559717.3003666  (2021-05-09 13:28:37)
                             'size'  2949120