<pre>
======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '194'
                                          'artist'  'Harold Arlen with Leo Reisman and His Orchestra'
                                     'text_people'  ''
                                         'release'  '20s and 30s popular'
                                           'title'  'Stormy Weather'
                                           'quals'  ("['Q-UNU-1', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-HHRNBTT-1', 'Q-OLDST-1', "
 "'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-2', 'q-chart-2', "
 "'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-3', 'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1933'
                                        'comments'  ''
                                           'genre'  'soundtrack-video'
                                             'bpm'  '110.845'
                                             'key'  '9B'
                                        'acoustid'  ''
rest: ''

======================== rawer (from filesystem) ========================<mutagen.mp3.MPEGInfo object at 0x7f9537d753d0>

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''<br/>                                     <img style="width:150px" src="image?fid=1132517"/>
'PRIV:AverageLevel:Ç\x0e\x00\x00'                   PRIV(owner='AverageLevel', data=b'\xc7\x0e\x00\x00')
'PRIV:PeakValue:Ý|\x00\x00'                         PRIV(owner='PeakValue', data=b'\xdd|\x00\x00')
'PRIV:WM/MediaClassPrimaryID:¼}`Ñ#ãâK\x86¡H¤*(D\x1e'  PRIV(owner='WM/MediaClassPrimaryID', data=b'\xbc}`\xd1#\xe3\xe2K\x86\xa1H\xa4*(D\x1e')
'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')
'TALB' (Album/Movie/Show title)                     '20s and 30s popular'
'TBPM' (BPM (beats per minute))                     '110.845'
'TCON' (Content type, a.k.a. Genre)                 'soundtrack-video'
'TDRC' (Recording time)                             '1933'
'TIT2' (Title/songname/content description)         'Stormy Weather'
'TKEY' (Initial key)                                '9B'
'TLEN' (Length)                                     '194783'
'TPE1' (Lead performer(s)/Soloist(s))               'Harold Arlen with Leo Reisman and His Orchestra'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.86 dB'
'TXXX:replaygain_track_peak'                        '0.580049'

========================== row from database ==========================
                                              'id'  1132517
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1920s and 1930s popular/Leo Reisman & His Casino Royal Orchestra, Harold Arlen - Stormy Weather 1933.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  194
                                           'genre'  soundtrack-video
                                        'filesize'  3184640
                                           'mtime'  1620331582
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1920s 1930s & Casino Royal Orchestra, 1933 soundtrack video
                                      'tag_artist'  Harold Arlen with Leo Reisman and His Orchestra
                                     'tag_release'  20s and 30s popular
                                       'tag_title'  Stormy Weather
                                             'bpm'  110.845
                                    'search_title'  'stormy':1 'weather':2
                                   'search_artist'  'and':6 'arlen':2 'harold':1 'his':7 'leo':4 'orchestra':8 'reisman':5 'with':3
                                  'search_release'  '20s':1 '30s':3 'and':2 'popular':4
                                     'search_rest'  '00oldiepop':5 '1920s':6 '1930s':7 '1933':12 'casino':8 'country':4 'exotica':2 'jazz':1 'oldies':3 'orchestra':10,11 'royal':9 'soundtrack':13 'video':14
                                    'search_combo'  '00oldiepop':19 '1920s':20 '1930s':21 '1933':26 '20s':11C '30s':13C 'and':8B,12C 'arlen':4B 'casino':22 'country':18 'exotica':16 'harold':3B 'his':9B 'jazz':15 'leo':6B 'oldies':17 'orchestra':10B,24,25 'popular':14C 'reisman':7B 'royal':23 'soundtrack':27 'stormy':1A 'video':28 'weather':2A 'with':5B
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  9B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  1933
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620331582.111825  (2021-05-06 22:06:22)
                             'size'  3184640