======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '156'
                                          'artist'  'Nappy Brown'
                                     'text_people'  ''
                                         'release'  "The Golden Age of American Rock 'n' Roll, Vol. 4"
                                           'title'  'Little By Little'
                                           'quals'  ("['Q-JZFKS-3', 'Q-LOCALNESS-1', 'Q-UNU-1', '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-4', 'q-mixbeat-1']")
                                      'lastfmtags'  "['rock and roll', 'blues', 'rhythm and blues', 'soul', 'oldies']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '305'
                                      'tracktotal'  ''
                                            'date'  '1957'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '89.021'
                                             'key'  '8B'
                                        'acoustid'  ''
rest: ''

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

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'TALB' (Album/Movie/Show title)                     "The Golden Age of American Rock 'n' Roll, Vol. 4"
'TBPM' (BPM (beats per minute))                     '89.021'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1957'
'TIT2' (Title/songname/content description)         'Little By Little'
'TKEY' (Initial key)                                '8B'
'TLEN' (Length)                                     '156933'
'TPE1' (Lead performer(s)/Soloist(s))               'Nappy Brown'
'TPUB' (Publisher)                                  'Ace'
'TRCK' (Track number/Position in set)               '305'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['rock and roll', 'blues', 'rhythm and blues', 'soul', 'oldies']
'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'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.27 dB'
'TXXX:replaygain_track_peak'                        '0.473311'

========================== row from database ==========================
                                              'id'  1443660
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1957/1957-305 - Nappy Brown - Little By Little.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  156
                                           'genre'  prerock-unsorted
                                        'filesize'  6275916
                                           'mtime'  1620387709
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1957 1957 305 prerock unsorted
                                      'tag_artist'  Nappy Brown
                                     'tag_release'  The Golden Age of American Rock 'n' Roll, Vol. 4
                                       'tag_title'  Little By Little
                                             'bpm'  89.021
                                    'search_title'  'by':2 'little':1
                                   'search_artist'  'brown':2 'nappy':1
                                  'search_release'  '4':13 'age':3 'american':5 'golden':2 'n':7,8 'of':4 'rock':6 'roll':9,10 'the':1 'vol':11,12
                                     'search_rest'  '00oldiepop':5 '1957':6 '305':7 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':8 'unsorted':9
                                    'search_combo'  '00oldiepop':22 '1957':23 '305':24 '4':17C 'age':7C 'american':9C 'brown':4B 'by':2A 'country':21 'exotica':19 'golden':6C 'jazz':18 'little':1A 'n':11C,12C 'nappy':3B 'of':8C 'oldies':20 'prerock':25 'rock':10C 'roll':13C,14C 'the':5C 'unsorted':26 'vol':15C,16C
                                    'tag_tracknum'  305
                                      'num_images'  0
                                             'key'  8B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'q-bass-4', 'q-grit-1']
                                      'lastfmtags'  ['rock and roll', 'blues', 'rhythm and blues', 'soul', 'oldies']
                                        'tag_date'  1957
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620387708.9911528  (2021-05-07 13:41:48)
                             'size'  6275916