======================== unified (from filesystem) ========================
                                         'bitrate'  '160.128'
                                        'duration'  '128'
                                          'artist'  'Byelorussia'
                                     'text_people'  ''
                                         'release'  'Songs of the Earth - Astonishing and Rare Voices'
                                           'title'  'Round-Spring Dance'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-OLDST-1', 'Q-UNU-3', 'Q-LOCALNESS-4', "
 "'Q-HHRNBTT-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '09'
                                      'tracktotal'  ''
                                            'date'  '1998'
                                        'comments'  ''
                                           'genre'  'loc-unsorted-mix'
                                             'bpm'  '101.973'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Songs of the Earth - Astonishing and Rare Voices'
'TBPM' (BPM (beats per minute))                     '101.973'
'TCON' (Content type, a.k.a. Genre)                 'loc-unsorted-mix'
'TDRC' (Recording time)                             '1998'
'TIT2' (Title/songname/content description)         'Round-Spring Dance'
'TKEY' (Initial key)                                '7B'
'TPE1' (Lead performer(s)/Soloist(s))               'Byelorussia'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '09'
'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: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'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.85 dB'
'TXXX:replaygain_track_peak'                        '0.416056'

========================== row from database ==========================
                                              'id'  472667
                                            'path'  /data/Music/Bulk/00localcharacter/VA. World 1： Trad/Songs Of The Earth： Astonishing and Rare Voices (Auvidis, Unesco, 1998) [160k]/09 - Byelorussia - Round-Spring Dance.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  128
                                           'genre'  loc-unsorted-mix
                                        'filesize'  2569632
                                           'mtime'  1621627237
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter VA. World 1： Trad Of The Earth： (Auvidis, Unesco, 1998) [160k] 09 loc unsorted mix
                                      'tag_artist'  Byelorussia
                                     'tag_release'  Songs of the Earth - Astonishing and Rare Voices
                                       'tag_title'  Round-Spring Dance
                                             'bpm'  101.973
                                    'search_title'  'dance':4 'round':1 'roundspring':3 'spring':2
                                   'search_artist'  'byelorussia':1
                                  'search_release'  'and':6 'astonishing':5 'earth':4 'of':2 'rare':7 'songs':1 'the':3 'voices':8
                                     'search_rest'  '1':4,5,6 '160k':19,20 '1998':17,18 'auvidis':13,14 'earth':10,11,12 'loc':21 'mix':23 'of':8 'the':9 'trad':7 'unesco':15,16 'unsorted':22 'va':1,2 'world':3
                                    'search_combo'  '1':17,18,19 '160k':32,33 '1998':30,31 'and':11C 'astonishing':10C 'auvidis':26,27 'byelorussia':5B 'dance':4A 'earth':9C,23,24,25 'loc':34 'mix':36 'of':7C,21 'rare':12C 'round':1A 'roundspring':3A 'songs':6C 'spring':2A 'the':8C,22 'trad':20 'unesco':28,29 'unsorted':35 'va':14,15 'voices':13C 'world':16
                                    'tag_tracknum'  9
                                      'num_images'  0
                                             'key'  7B
                                           '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-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  1998
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621627237.130248  (2021-05-21 22:00:37)
                             'size'  2569632