======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '163'
                                          'artist'  'USSR Melodia Recording'
                                     'text_people'  ''
                                         'release'  'How Stereo Works'
                                           'title'  'High Quality Stereophonic Sound'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-OLDST-2', 'Q-JZFKS-1', "
 "'Q-HHRNBTT-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'nonmusic-speech-instruction'
                                             'bpm'  '140.2'
                                             'key'  '1B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'How Stereo Works'
'TBPM' (BPM (beats per minute))                     '140.2'
'TCON' (Content type, a.k.a. Genre)                 'nonmusic-speech-instruction'
'TIT2' (Title/songname/content description)         'High Quality Stereophonic Sound'
'TKEY' (Initial key)                                '1B'
'TPE1' (Lead performer(s)/Soloist(s))               'USSR Melodia Recording'
'TXXX:Mp3gain_minmax'                               '000,189'
'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: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'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-0.43 dB'
'TXXX:replaygain_track_peak'                        '0.587129'

========================== row from database ==========================
                                              'id'  746143
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/USSR Melodia Recording ¨.¨ How Stereo works ¨.¨ [192k]/007_Unknown Artist - How Stereo Works ~ High Quality Stereophonic Sound.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  163
                                           'genre'  nonmusic-speech-instruction
                                        'filesize'  3924506
                                           'mtime'  1620561427
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm ¨.¨ works ¨.¨ [192k] 007_Unknown Artist ~ nonmusic speech instruction
                                      'tag_artist'  USSR Melodia Recording
                                     'tag_release'  How Stereo Works
                                       'tag_title'  High Quality Stereophonic Sound
                                             'bpm'  140.2
                                    'search_title'  'high':1 'quality':2 'sound':4 'stereophonic':3
                                   'search_artist'  'melodia':2 'recording':3 'ussr':1
                                  'search_release'  'how':1 'stereo':2 'works':3
                                     'search_rest'  '007':4 '192k':2,3 'artist':6 'instruction':9 'nonmusic':7 'speech':8 'unknown':5 'works':1
                                    'search_combo'  '007':14 '192k':12,13 'artist':16 'high':1A 'how':8C 'instruction':19 'melodia':6B 'nonmusic':17 'quality':2A 'recording':7B 'sound':4A 'speech':18 'stereo':9C 'stereophonic':3A 'unknown':15 'ussr':5B 'works':10C,11
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  1B
                                           '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-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561427.1864023  (2021-05-09 13:57:07)
                             'size'  3924506