======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '158'
                                          'artist'  'Zhou Xuan'
                                     'text_people'  ''
                                         'release'  'Zhou Xuan Sound Treasure Collected'
                                           'title'  'A Singing-Girl In The Remotest Of The Earth'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-3', 'Q-HHRNBTT-1', 'Q-JZFKS-1', 'Q-OLDST-1', "
 "'Q-LOCALNESS-4', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['shidaiqu', 'chinese', 'chinese oldies', 'female vocalists', 'vocal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '01'
                                      'tracktotal'  ''
                                            'date'  '2006'
                                        'comments'  ''
                                           'genre'  'loc-asia-china'
                                             'bpm'  '142.7'
                                             'key'  '12A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Zhou Xuan Sound Treasure Collected'
'TBPM' (BPM (beats per minute))                     '142.7'
'TCON' (Content type, a.k.a. Genre)                 'loc-asia-china'
'TDRC' (Recording time)                             '2006'
'TIT2' (Title/songname/content description)         'A Singing-Girl In The Remotest Of The Earth'
'TKEY' (Initial key)                                '12A'
'TPE1' (Lead performer(s)/Soloist(s))               'Zhou Xuan'
'TPE2' (Band/orchestra/accompaniment)               'Zhou Xuan'
'TRCK' (Track number/Position in set)               '01'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '4'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '3'
'TXXX:lastfmtags'                                   ['shidaiqu', 'chinese', 'chinese oldies', 'female vocalists', 'vocal']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'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'                        '-0.09 dB'
'TXXX:replaygain_track_peak'                        '0.522068'

========================== row from database ==========================
                                              'id'  470413
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/sound treasure collected/01 - A Singing-Girl In The Remotest Of The Earth.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  158
                                           'genre'  loc-asia-china
                                        'filesize'  6333322
                                           'mtime'  1621626215
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm sound treasure collected 01 loc asia china
                                      'tag_artist'  Zhou Xuan
                                     'tag_release'  Zhou Xuan Sound Treasure Collected
                                       'tag_title'  A Singing-Girl In The Remotest Of The Earth
                                             'bpm'  142.7
                                    'search_title'  'a':1 'earth':9 'girl':3 'in':5 'of':8 'remotest':7 'singing':2 'singinggirl':4 'the':6
                                   'search_artist'  'xuan':2 'zhou':1
                                  'search_release'  'collected':5 'sound':3 'treasure':4 'xuan':2 'zhou':1
                                     'search_rest'  'asia':5 'china':6 'collected':3 'loc':4 'sound':1 'treasure':2
                                    'search_combo'  'a':1A 'asia':21 'china':22 'collected':16C,19 'earth':9A 'girl':3A 'in':5A 'loc':20 'of':8A 'remotest':7A 'singing':2A 'singinggirl':4A 'sound':14C,17 'the':6A 'treasure':15C,18 'xuan':11B,13C 'zhou':10B,12C
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  12A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-4', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-3', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['shidaiqu', 'chinese', 'chinese oldies', 'female vocalists', 'vocal']
                                        'tag_date'  2006
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621626214.725428  (2021-05-21 21:43:34)
                             'size'  6333322