======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '153'
                                          'artist'  'Columbia Orch'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  "Charge of Roosevelt's Rough Riders"
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-2', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1898'
                                        'comments'  ''
                                           'genre'  'prerock-band'
                                             'bpm'  '117.1'
                                             'key'  '5A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '117.1'
'TCON' (Content type, a.k.a. Genre)                 'prerock-band'
'TDRC' (Recording time)                             '1898'
'TIT2' (Title/songname/content description)         "Charge of Roosevelt's Rough Riders"
'TKEY' (Initial key)                                '5A'
'TPE1' (Lead performer(s)/Soloist(s))               'Columbia Orch'
'TXXX:Mp3gain_minmax'                               '121,169'
'TXXX:Mp3gain_undo'                                 '+003,+003,N'
'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'                                       '3'
'TXXX:q-chart'                                      '2'
'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'                        '-0.32 dB'
'TXXX:replaygain_track_peak'                        '0.484739'

========================== row from database ==========================
                                              'id'  1502259
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Wax Cylinder／very old recordings： 1878-1920 [wma／32k]/1898 - Columbia Orch - Charge of Roosevelt_s Rough Riders.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  153
                                           'genre'  prerock-band
                                        'filesize'  2462959
                                           'mtime'  1620561434
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Wax Cylinder／very old recordings： 1878 1920 [wma／32k] 1898 Roosevelt_s prerock band
                                      'tag_artist'  Columbia Orch
                                     'tag_release'  None
                                       'tag_title'  Charge of Roosevelt's Rough Riders
                                             'bpm'  117.1
                                    'search_title'  'charge':1 'of':2 'riders':7 'roosevelt':3 'roosevelts':5 'rough':6 's':4
                                   'search_artist'  'columbia':1 'orch':2
                                  'search_release'  
                                     'search_rest'  '1878':11 '1898':20 '1920':12 '32k':14,16,18 'band':24 'cylinder':2,4 'cylindervery':6 'old':7 'prerock':23 'recordings':8,9,10 'roosevelt':21 's':22 'very':3,5 'wax':1 'wma':13,15,17 'wma32k':19
                                    'search_combo'  '1878':20 '1898':29 '1920':21 '32k':23,25,27 'band':33 'charge':1A 'columbia':8B 'cylinder':11,13 'cylindervery':15 'of':2A 'old':16 'orch':9B 'prerock':32 'recordings':17,18,19 'riders':7A 'roosevelt':3A,30 'roosevelts':5A 'rough':6A 's':4A,31 'very':12,14 'wax':10 'wma':22,24,26 'wma32k':28
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  5A
                                           '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-2', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1898
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561433.862935  (2021-05-09 13:57:13)
                             'size'  2462959