<pre>
======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '159'
                                          'artist'  'Otis Williams &amp; the Charms'
                                     'text_people'  'Rudy Toombs'
                                         'release'  'The Very Best of Otis Williams and His Charms: In Paradise, Vol. 2'
                                           'title'  'Gum Drop'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-2', 'Q-UNU-1', 'Q-JZFKS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'Q-PLAY-2', 'q-bass-3', 'q-busy-2', 'q-grit-1', "
 "'Q-PIANO-2', 'q-chart-2', 'q-drums-2', 'q-other-2', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['doo-wop', 'all', 'oldies', 'spotify', 'doo wop']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '07'
                                      'tracktotal'  ''
                                            'date'  '2005'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-unsorted'
                                             'bpm'  '146.000'
                                             'key'  '3A'
                                        'acoustid'  ''
rest: ''

======================== rawer (from filesystem) ========================<mutagen.mp3.MPEGInfo object at 0x7f9537d75370>

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'PRIV:WM/MediaClassSecondaryID:\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'  PRIV(owner='WM/MediaClassSecondaryID', data=b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
'PRIV:WM/Provider:A\x00M\x00G\x00\x00\x00'          PRIV(owner='WM/Provider', data=b'A\x00M\x00G\x00\x00\x00')
'PRIV:WM/UniqueFileIdentifier:A\x00M\x00G\x00a\x00_\x00i\x00d\x00=\x00R\x00 \x00 \x00 \x007\x002\x004\x003\x000\x005\x00;\x00A\x00M\x00G\x00p\x00_\x00i\x00d\x00=\x00P\x00 \x00 \x00 \x00 \x001\x004\x007\x003\x002\x00;\x00A\x00M\x00G\x00t\x00_\x00i\x00d\x00=\x00T\x00 \x00 \x007\x004\x004\x009\x006\x006\x007\x00\x00\x00'  PRIV(owner='WM/UniqueFileIdentifier', data=b'A\x00M\x00G\x00a\x00_\x00i\x00d\x00=\x00R\x00 \x00 \x00 \x007\x002\x004\x003\x000\x005\x00;\x00A\x00M\x00G\x00p\x00_\x00i\x00d\x00=\x00P\x00 \x00 \x00 \x00 \x001\x004\x007\x003\x002\x00;\x00A\x00M\x00G\x00t\x00_\x00i\x00d\x00=\x00T\x00 \x00 \x007\x004\x004\x009\x006\x006\x007\x00\x00\x00')
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'PRIV:WM/WMCollectionID:Ýn\x8aùögRF\x91\x80b\x87úÿÞÝ'  PRIV(owner='WM/WMCollectionID', data=b'\xddn\x8a\xf9\xf6gRF\x91\x80b\x87\xfa\xff\xde\xdd')
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'TALB' (Album/Movie/Show title)                     'The Very Best of Otis Williams and His Charms: In Paradise, Vol. 2'
'TBPM' (BPM (beats per minute))                     '146.000'
'TCOM' (Composer)                                   'Rudy Toombs'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-unsorted'
'TDRC' (Recording time)                             '2005'
'TIT2' (Title/songname/content description)         'Gum Drop'
'TKEY' (Initial key)                                '3A'
'TPE1' (Lead performer(s)/Soloist(s))               'Otis Williams &amp; the Charms'
'TPE2' (Band/orchestra/accompaniment)               'Otis Williams &amp; the Charms'
'TPUB' (Publisher)                                  'Collectables'
'TRCK' (Track number/Position in set)               '07'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['doo-wop', 'all', 'oldies', 'spotify', 'doo wop']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.65 dB'
'TXXX:replaygain_track_peak'                        '0.481845'

========================== row from database ==========================
                                              'id'  735916
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/sweets/Otis Williams & The Charms - Gum Drop.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  159
                                           'genre'  prerock-jb-jazz-unsorted
                                        'filesize'  3823247
                                           'mtime'  1620538098
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country sweets prerock jb jazz unsorted
                                      'tag_artist'  Otis Williams & the Charms
                                     'tag_release'  The Very Best of Otis Williams and His Charms: In Paradise, Vol. 2
                                       'tag_title'  Gum Drop
                                             'bpm'  146.0
                                    'search_title'  'drop':2 'gum':1
                                   'search_artist'  'charms':4 'otis':1 'the':3 'williams':2
                                  'search_release'  '2':16 'and':7 'best':3 'charms':9,10 'his':8 'in':11 'of':4 'otis':5 'paradise':12,13 'the':1 'very':2 'vol':14,15 'williams':6
                                     'search_rest'  'country':4 'exotica':2 'jazz':1 'jb':7 'oldies':3 'prerock':6 'sweets':5 'unsorted':8
                                    'search_combo'  '2':22C 'and':13C 'best':9C 'charms':6B,15C,16C 'country':26 'drop':2A 'exotica':24 'gum':1A 'his':14C 'in':17C 'jazz':23 'jb':29 'of':10C 'oldies':25 'otis':3B,11C 'paradise':18C,19C 'prerock':28 'sweets':27 'the':5B,7C 'unsorted':30 'very':8C 'vol':20C,21C 'williams':4B,12C
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  3A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-2', 'q-mixbeat-1', 'Q-PIANO-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-2', 'q-drums-2', 'q-syn-1', 'q-chart-2', 'q-other-2', 'Q-HAP-3', 'Q-PLAY-2', 'q-bass-3', 'q-grit-1']
                                      'lastfmtags'  ['doo-wop', 'all', 'oldies', 'spotify', 'doo wop']
                                        'tag_date'  2005
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620538097.7414653  (2021-05-09 07:28:17)
                             'size'  3823247