<pre>
======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '315'
                                          'artist'  'Joe Satriani'
                                     'text_people'  ''
                                         'release'  'The Electric Joe Satriani: An Anthology'
                                           'title'  'Crushing Day'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-OLDST-2', 'Q-HHRNBTT-1', "
 "'Q-LOCALNESS-1', 'q-syn-2', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-4', 'q-other-3', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['instrumental', 'guitar', 'guitar virtuoso', 'instrumental rock', 'rock']"
                                     'discogstags'  "['rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  '15'
                                            'date'  '2003'
                                        'comments'  ''
                                           'genre'  'rock-instrumental'
                                             'bpm'  '108.4'
                                             'key'  '4A'
                                        'acoustid'  '53df353b-1242-4c5e-8228-8d5f7a213969'
rest: ''

======================== rawer (from filesystem) ========================<mutagen.mp3.MPEGInfo object at 0x7f9537d81bb0>

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''<br/>                                     <img style="width:150px" src="image?fid=1487458"/>
'TALB' (Album/Movie/Show title)                     'The Electric Joe Satriani: An Anthology'
'TBPM' (BPM (beats per minute))                     '108.4'
'TCON' (Content type, a.k.a. Genre)                 'rock-instrumental'
'TDOR' (Original release time)                      '2003'
'TDRC' (Recording time)                             '2003'
'TIT2' (Title/songname/content description)         'Crushing Day'
'TKEY' (Initial key)                                '4A'
'TMED' (Media type)                                 'CD'
'TPE1' (Lead performer(s)/Soloist(s))               'Joe Satriani'
'TPE2' (Band/orchestra/accompaniment)               'Joe Satriani'
'TPOS' (Part of a set)                              '1/2'
'TPUB' (Publisher)                                  'Epic/Legacy'
'TRCK' (Track number/Position in set)               '4/15'
'TSO2'                                              'Satriani, Joe'
'TSOP' (Performer sort order)                       'Satriani, Joe'
'TSRC' (ISRC (international standard recording code))  'USSM18700086'
'TSST' (Set subtitle)                               'The Electric Joe Satriani: An Anthology'
'TXXX:Acoustid Id'                                  '53df353b-1242-4c5e-8228-8d5f7a213969'
'TXXX:Artists'                                      'Joe Satriani'
'TXXX:CATALOGNUMBER'                                'EPC 513869 2, 5138692000'
'TXXX:MusicBrainz Album Artist Id'                  '29762c82-bb92-4acd-b1fb-09cc4da250d2'
'TXXX:MusicBrainz Album Id'                         '4460aa93-f99b-4726-98bc-2bfca5873152'
'TXXX:MusicBrainz Album Release Country'            'AT'
'TXXX:MusicBrainz Album Status'                     'official'
'TXXX:MusicBrainz Album Type'                       'album/compilation'
'TXXX:MusicBrainz Artist Id'                        '29762c82-bb92-4acd-b1fb-09cc4da250d2'
'TXXX:MusicBrainz Release Group Id'                 '8bc04441-9523-32c1-8537-c74363f58c0d'
'TXXX:MusicBrainz Release Track Id'                 '0a731665-b73d-4898-bee1-6ddb005e2eff'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:SCRIPT'                                       'Latn'
'TXXX:discogstags'                                  'rock'
'TXXX:lastfmtags'                                   ['instrumental', 'guitar', 'guitar virtuoso', 'instrumental rock', 'rock']
'TXXX:originalyear'                                 '2003'
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-0.25 dB'
'TXXX:replaygain_track_peak'                        '0.450179'
'UFID:http://musicbrainz.org'                       UFID(owner='http://musicbrainz.org', data=b'a32dc399-dc07-4818-927d-794fc0bbed61')

========================== row from database ==========================
                                              'id'  1487458
                                            'path'  /data/Music/Bulk/00poprockelectronic/Joe Satriani/A/04 - Joe Satriani - Crushing Day.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  315
                                           'genre'  rock-instrumental
                                        'filesize'  7628405
                                           'mtime'  1636917958
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic 04 rock instrumental
                                      'tag_artist'  Joe Satriani
                                     'tag_release'  The Electric Joe Satriani: An Anthology
                                       'tag_title'  Crushing Day
                                             'bpm'  108.4
                                    'search_title'  'crushing':1 'day':2
                                   'search_artist'  'joe':1 'satriani':2
                                  'search_release'  'an':6 'anthology':7 'electric':2 'joe':3 'satriani':4,5 'the':1
                                     'search_rest'  '00poprockelectronic':1 'instrumental':3 'rock':2
                                    'search_combo'  '00poprockelectronic':12 'an':10C 'anthology':11C 'crushing':1A 'day':2A 'electric':6C 'instrumental':14 'joe':3B,7C 'rock':13 'satriani':4B,8C,9C 'the':5C
                                    'tag_tracknum'  4
                                      'num_images'  1
                                             'key'  4A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-4', 'q-syn-2', 'q-chart-3', 'q-other-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['instrumental', 'guitar', 'guitar virtuoso', 'instrumental rock', 'rock']
                                        'tag_date'  2003
                                     'discogstags'  ['rock']

============================== file details ==============================
                                           'mtime'  1636917957.7825246  (2021-11-14 20:25:57)
                             'size'  7628405