======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '361'
                                          'artist'  'Ella Fitzgerald & Louis Armstrong'
                                     'text_people'  ''
                                         'release'  'Ella & Louis Sing Gershwin'
                                           'title'  'How Long Has This Been Going On'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-2', 'Q-JZFKS-3', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'Q-PLAY-3', 'q-syn-1', 'q-bass-4', 'q-busy-3', 'q-grit-2', "
 "'Q-PIANO-2', 'q-chart-3', 'q-drums-1', 'q-other-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['blues', 'jazz', 'vocal jazz', 'jazz vocal', 'swing']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1955'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-vocal'
                                             'bpm'  '117.740'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Ella & Louis Sing Gershwin'
'TBPM' (BPM (beats per minute))                     '117.740'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-vocal'
'TDRC' (Recording time)                             '1955'
'TIT2' (Title/songname/content description)         'How Long Has This Been Going On'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Ella Fitzgerald & Louis Armstrong'
'TXXX:Mp3gain_minmax'                               '000,199'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:Tracknum'                                     '10'
'TXXX:lastfmtags'                                   ['blues', 'jazz', 'vocal jazz', 'jazz vocal', 'swing']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.68 dB'
'TXXX:replaygain_track_peak'                        '1.059839'

========================== row from database ==========================
                                              'id'  794020
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Fitzgerald, Ella/Ella & Louis Sing Gershwin/Ella Fitzgerald & Louis Armstrong - How Long Has This Been Going On - 10.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  361
                                           'genre'  prerock-jb-jazz-vocal
                                        'filesize'  5779048
                                           'mtime'  1620528849
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country Fitzgerald, 10 prerock jb jazz vocal
                                      'tag_artist'  Ella Fitzgerald & Louis Armstrong
                                     'tag_release'  Ella & Louis Sing Gershwin
                                       'tag_title'  How Long Has This Been Going On
                                             'bpm'  117.74
                                    'search_title'  'been':5 'going':6 'has':3 'how':1 'long':2 'on':7 'this':4
                                   'search_artist'  'armstrong':4 'ella':1 'fitzgerald':2 'louis':3
                                  'search_release'  'ella':1 'gershwin':4 'louis':2 'sing':3
                                     'search_rest'  'country':4 'exotica':2 'fitzgerald':5,6 'jazz':1 'jb':8 'oldies':3 'prerock':7 'vocal':9
                                    'search_combo'  'armstrong':11B 'been':5A 'country':19 'ella':8B,12C 'exotica':17 'fitzgerald':9B,20,21 'gershwin':15C 'going':6A 'has':3A 'how':1A 'jazz':16 'jb':23 'long':2A 'louis':10B,13C 'oldies':18 'on':7A 'prerock':22 'sing':14C 'this':4A 'vocal':24
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-2', 'q-mixbeat-1', 'Q-PIANO-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-1', 'Q-HAP-3', 'Q-PLAY-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['blues', 'jazz', 'vocal jazz', 'jazz vocal', 'swing']
                                        'tag_date'  1955
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620528848.8174777  (2021-05-09 04:54:08)
                             'size'  5779048