======================== unified (from filesystem) ========================
                                         'bitrate'  '64.0'
                                        'duration'  '147'
                                          'artist'  'U.S. Marine Band'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'The Thunderer'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-1', '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-4', 'q-other-3', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['hymn', '1890 1900', 'breaking bad', 'classical', 'song of the marines']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1890'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '133.2'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'COMM::eng'                                         'Debuted 1890 and peaked at #1 on Various Charts. Source: Pop Memories'
'TBPM' (BPM (beats per minute))                     '133.2'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1890'
'TIT2' (Title/songname/content description)         'The Thunderer'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'U.S. Marine Band'
'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'                                   ['hymn', '1890 1900', 'breaking bad', 'classical', 'song of the marines']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '4'
'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'                                     '1'
'TXXX:replaygain_track_gain'                        '-0.47 dB'
'TXXX:replaygain_track_peak'                        '0.848242'

========================== row from database ==========================
                                              'id'  513971
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1890 - U.S. Marine Band [003] - The Thunderer 64 M (2.27).mp3
                                         'working'  None
                                         'bitrate'  64
                                    'duration_sec'  147
                                           'genre'  prerock-unsorted
                                        'filesize'  1183616
                                           'mtime'  1621698444
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1890 [003] 64 (2.27) prerock unsorted
                                      'tag_artist'  U.S. Marine Band
                                     'tag_release'  None
                                       'tag_title'  The Thunderer
                                             'bpm'  133.2
                                    'search_title'  'the':1 'thunderer':2
                                   'search_artist'  'band':5 'marine':4 's':2 'u':1 'us':3
                                  'search_release'  
                                     'search_rest'  '003':21,22 '1878':11 '1890':20 '1920':12 '2':24 '227':26 '27':25 '32k':14,16,18 '64':23 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':27 'recordings':8,9,10 'unsorted':28 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '003':28,29 '1878':18 '1890':27 '1920':19 '2':31 '227':33 '27':32 '32k':21,23,25 '64':30 'band':7B 'cylinder':9,11 'cylindervery':13 'marine':6B 'old':14 'prerock':34 'recordings':15,16,17 's':4B 'the':1A 'thunderer':2A 'u':3B 'unsorted':35 'us':5B 'very':10,12 'wax':8 'wma':20,22,24 'wma32k':26
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  8A
                                           '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-1', 'q-busy-2', 'q-drums-4', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['hymn', '1890 1900', 'breaking bad', 'classical', 'song of the marines']
                                        'tag_date'  1890
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621698444.2322116  (2021-05-22 17:47:24)
                             'size'  1183616