======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '274'
                                          'artist'  'Hessien'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'A Letter From Engels'
                                           'quals'  ("['Q-HAP-2', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-JZFKS-1', 'Q-LOCALNESS-1', "
 "'Q-OLDST-3', 'q-syn-3', 'Q-PLAY-3', 'q-bass-4', 'q-busy-2', 'q-grit-2', "
 "'Q-PIANO-2', 'q-chart-1', 'q-drums-1', 'q-other-3', 'q-vocals-2', "
 "'q-mixbeat-2']")
                                      'lastfmtags'  "['instrumental', 'acoustic', 'modern classical', 'guitar', 'ambient']"
                                     'discogstags'  "['electronic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'electronic-drone'
                                             'bpm'  '136.8'
                                             'key'  '10B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '136.8'
'TCON' (Content type, a.k.a. Genre)                 'electronic-drone'
'TIT2' (Title/songname/content description)         'A Letter From Engels'
'TKEY' (Initial key)                                '10B'
'TPE1' (Lead performer(s)/Soloist(s))               'Hessien'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'electronic'
'TXXX:lastfmtags'                                   ['instrumental', 'acoustic', 'modern classical', 'guitar', 'ambient']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '3'
'TXXX:q-syn'                                        '3'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '-1.84 dB'
'TXXX:replaygain_track_peak'                        '0.500644'

========================== row from database ==========================
                                              'id'  1425025
                                            'path'  /data/Music/Bulk/00poprockelectronic/00drone/Hessien - A Letter From Engels.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  274
                                           'genre'  electronic-drone
                                        'filesize'  5490190
                                           'mtime'  1636912825
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic 00drone electronic drone
                                      'tag_artist'  Hessien
                                     'tag_release'  None
                                       'tag_title'  A Letter From Engels
                                             'bpm'  136.8
                                    'search_title'  'a':1 'engels':4 'from':3 'letter':2
                                   'search_artist'  'hessien':1
                                  'search_release'  
                                     'search_rest'  '00drone':2 '00poprockelectronic':1 'drone':4 'electronic':3
                                    'search_combo'  '00drone':7 '00poprockelectronic':6 'a':1A 'drone':9 'electronic':8 'engels':4A 'from':3A 'hessien':5B 'letter':2A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  10B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-1', 'q-mixbeat-2', 'Q-PIANO-2', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-3', 'q-chart-1', 'q-other-3', 'Q-HAP-2', 'Q-PLAY-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['instrumental', 'acoustic', 'modern classical', 'guitar', 'ambient']
                                        'tag_date'  
                                     'discogstags'  ['electronic']

============================== file details ==============================
                                           'mtime'  1636912824.9903998  (2021-11-14 19:00:24)
                             'size'  5490190