======================== unified (from filesystem) ========================
                                         'bitrate'  '199.13'
                                        'duration'  '10'
                                          'artist'  'Mrs. Arthur MacArthur'
                                     'text_people'  ''
                                         'release'  'Celtic Mouth Music'
                                           'title'  '"... just a song you can dance to ..."'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-HHRNBTT-1', 'Q-UNU-3', 'Q-OLDST-1', "
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 "'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'  '1'
                                      'tracktotal'  '37'
                                            'date'  '1997'
                                        'comments'  ''
                                           'genre'  'loc-eur'
                                             'bpm'  '107.7'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'PRIV:AverageLevel:.\x0e\x00\x00'                   PRIV(owner='AverageLevel', data=b'.\x0e\x00\x00')
'PRIV:PeakValue:Im\x00\x00'                         PRIV(owner='PeakValue', data=b'Im\x00\x00')
'TALB' (Album/Movie/Show title)                     'Celtic Mouth Music'
'TBPM' (BPM (beats per minute))                     '107.7'
'TCMP'                                              '1'
'TCON' (Content type, a.k.a. Genre)                 'loc-eur'
'TDOR' (Original release time)                      '1997'
'TDRC' (Recording time)                             '1997'
'TIT2' (Title/songname/content description)         '"... just a song you can dance to ..."'
'TKEY' (Initial key)                                '8A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Mrs. Arthur MacArthur'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '1/1'
'TPUB' (Publisher)                                  'Ellipsis Arts...'
'TRCK' (Track number/Position in set)               '1/37'
'TSO2'                                              'Various Artists'
'TSOP' (Performer sort order)                       'MacArthur, Mrs. Arthur'
'TXXX:ASIN'                                         'B0000059U2'
'TXXX:CATALOGNUMBER'                                'CD4070'
'TXXX:MusicBrainz Album Artist Id'                  '89ad4ac3-39f7-470e-963a-56509c546377'
'TXXX:MusicBrainz Album Id'                         '121bdc02-f649-4092-aac0-cb5a9b8f1621'
'TXXX:MusicBrainz Album Release Country'            'US'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'compilation'
'TXXX:MusicBrainz Artist Id'                        '57ca072c-af08-45e5-8438-e7485865211e'
'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:SCRIPT'                                       'Latn'
'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'                        '+2.13 dB'
'TXXX:replaygain_track_peak'                        '0.507681'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'c7fb0419-4727-473f-b204-23e768bbbb63')

========================== row from database ==========================
                                              'id'  1476567
                                            'path'  /data/Music/Bulk/00localcharacter/VA. World 1： Trad/Celtic Mouth Music (Ellipsis Arts, 1997) [202k VBR]/01-Scottish Dance Song .mp3
                                         'working'  None
                                         'bitrate'  199
                                    'duration_sec'  10
                                           'genre'  loc-eur
                                        'filesize'  262033
                                           'mtime'  1620536145
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter VA. World 1： Trad (Ellipsis Arts, 1997) [202k VBR] 01 Scottish Dance Song loc eur
                                      'tag_artist'  Mrs. Arthur MacArthur
                                     'tag_release'  Celtic Mouth Music
                                       'tag_title'  "... just a song you can dance to ..."
                                             'bpm'  107.7
                                    'search_title'  'a':2 'can':5 'dance':6 'just':1 'song':3 'to':7 'you':4
                                   'search_artist'  'arthur':3 'mac':5 'macarthur':4 'mrs':1,2
                                  'search_release'  'celtic':1 'mouth':2 'music':3
                                     'search_rest'  '1':4,5,6 '1997':12,13 '202k':14,15 'arts':10,11 'dance':19 'ellipsis':8,9 'eur':22 'loc':21 'scottish':18 'song':20 'trad':7 'va':1,2 'vbr':16,17 'world':3
                                    'search_combo'  '1':19,20,21 '1997':27,28 '202k':29,30 'a':2A 'arthur':10B 'arts':25,26 'can':5A 'celtic':13C 'dance':6A,34 'ellipsis':23,24 'eur':37 'just':1A 'loc':36 'mac':12B 'macarthur':11B 'mouth':14C 'mrs':8B,9B 'music':15C 'scottish':33 'song':3A,35 'to':7A 'trad':22 'va':16,17 'vbr':31,32 'world':18 'you':4A
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  8A
                                           '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'  1997
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620536144.9621892  (2021-05-09 06:55:44)
                             'size'  262033