======================== unified (from filesystem) ========================
                                         'bitrate'  '232.583'
                                        'duration'  '143'
                                          'artist'  '101 Strings'
                                     'text_people'  'Al Sherman'
                                         'release'  'Tango!'
                                           'title'  'Muy Tango (Tango Very Much)'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-OLDST-3', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', "
 "'Q-UNU-1', 'Q-SYN-1', 'Q-BUSY-3', 'Q-GRIT-1', 'q-bass-2', 'q-play-2', "
 "'Q-CHART-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'Q-MIXBEAT-1']")
                                      'lastfmtags'  "['instrumental', 'strings', 'myhitparade', 'myhits', 'easy listening']"
                                     'discogstags'  "['tango', 'latin']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '08'
                                      'tracktotal'  ''
                                            'date'  '1969'
                                        'comments'  ''
                                           'genre'  'electronic-generic or radio-easy listening'
                                             'bpm'  '131.1'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM::eng'                                         "aka 'The World's Most Famous Continental Tangos'"
'GEOB:SfMarkers'                                    GEOB(encoding=<Encoding.LATIN1: 0>, mime='', filename='', desc='SfMarkers', data=b'\x0c\x00\x00\x00d\x00\x00\x00\x00\x00\x00\x00')
'TALB' (Album/Movie/Show title)                     'Tango!'
'TBPM' (BPM (beats per minute))                     '131.1'
'TCOM' (Composer)                                   'Al Sherman'
'TCON' (Content type, a.k.a. Genre)                 'electronic-generic or radio-easy listening'
'TDRC' (Recording time)                             '1969'
'TIT2' (Title/songname/content description)         'Muy Tango (Tango Very Much)'
'TKEY' (Initial key)                                '10A'
'TLEN' (Length)                                     '146200'
'TPE1' (Lead performer(s)/Soloist(s))               '101 Strings'
'TPE2' (Band/orchestra/accompaniment)               '101 Strings'
'TPOS' (Part of a set)                              'B'
'TRCK' (Track number/Position in set)               '08'
'TXXX:Q-BUSY'                                       '3'
'TXXX:Q-CHART'                                      '2'
'TXXX:Q-GRIT'                                       '1'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-MIXBEAT'                                    '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-SYN'                                        '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['tango', 'latin']
'TXXX:lastfmtags'                                   ['instrumental', 'strings', 'myhitparade', 'myhits', 'easy listening']
'TXXX:q-bass'                                       '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-0.63 dB'
'TXXX:replaygain_track_peak'                        '0.569940'

========================== row from database ==========================
                                              'id'  1479070
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/The 101 Strings Orchestra/1969 - Tango!/08 - Muy Tango (Tango Very Much).mp3
                                         'working'  None
                                         'bitrate'  232
                                    'duration_sec'  143
                                           'genre'  electronic-generic or radio-easy listening
                                        'filesize'  4273271
                                           'mtime'  1621705528
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country The Orchestra 1969 08 electronic generic or radio easy listening
                                      'tag_artist'  101 Strings
                                     'tag_release'  Tango!
                                       'tag_title'  Muy Tango (Tango Very Much)
                                             'bpm'  131.1
                                    'search_title'  'much':5,6 'muy':1 'tango':2,3 'very':4
                                   'search_artist'  '101':1 'strings':2
                                  'search_release'  'tango':1
                                     'search_rest'  '1969':7 'country':4 'easy':12 'electronic':8 'exotica':2 'generic':9 'jazz':1 'listening':13 'oldies':3 'or':10 'orchestra':6 'radio':11 'the':5
                                    'search_combo'  '101':7B '1969':16 'country':13 'easy':21 'electronic':17 'exotica':11 'generic':18 'jazz':10 'listening':22 'much':5A,6A 'muy':1A 'oldies':12 'or':19 'orchestra':15 'radio':20 'strings':8B 'tango':2A,3A,9C 'the':14 'very':4A
                                    'tag_tracknum'  8
                                      'num_images'  1
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'Q-MIXBEAT-1', 'q-play-2', 'Q-OLDST-3', 'Q-GRIT-1', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-CHART-2', 'q-drums-1', 'Q-SYN-1', 'q-other-4', 'Q-BUSY-3', 'Q-HAP-3', 'q-bass-2']
                                      'lastfmtags'  ['instrumental', 'strings', 'myhitparade', 'myhits', 'easy listening']
                                        'tag_date'  1969
                                     'discogstags'  ['tango', 'latin']

============================== file details ==============================
                                           'mtime'  1621705527.8955586  (2021-05-22 19:45:27)
                             'size'  4273271