======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '218'
                                          'artist'  'Frédéric Chopin'
                                     'text_people'  ''
                                         'release'  'The World of Chopin'
                                           'title'  'Waltz in C sharp minor'
                                           'quals'  ("['Q-HAP-2', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'Q-PLAY-3', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', "
 "'q-chart-3', 'q-drums-1', 'q-other-1', 'q-vocals-1', 'q-mixbeat-1', "
 "'Q-PIANO-4']")
                                      'lastfmtags'  "['instrumental', 'polish', 'piano', 'romantic', 'classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  ''
                                            'date'  '1932'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '143.416'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The World of Chopin'
'TBPM' (BPM (beats per minute))                     '143.416'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1932'
'TIT2' (Title/songname/content description)         'Waltz in C sharp minor'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               'Frédéric Chopin'
'TRCK' (Track number/Position in set)               '4'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['instrumental', 'polish', 'piano', 'romantic', 'classical']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'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'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.81 dB'
'TXXX:replaygain_track_peak'                        '0.696453'

========================== row from database ==========================
                                              'id'  174000
                                            'path'  /data/Music/Bulk/00instruments-classical/Unsorted/Frederic Chopin__The World Of Chopin__04 - Waltz in C sharp minor.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  218
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  3502360
                                           'mtime'  1637329808
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Unsorted Frederic Chopin__The Of Chopin__04 prerock classical classical instruments
                                      'tag_artist'  Frédéric Chopin
                                     'tag_release'  The World of Chopin
                                       'tag_title'  Waltz in C sharp minor
                                             'bpm'  143.416
                                    'search_title'  'c':3 'in':2 'minor':5 'sharp':4 'waltz':1
                                   'search_artist'  'chopin':3 'frederic':1,2
                                  'search_release'  'chopin':4 'of':3 'the':1 'world':2
                                     'search_rest'  '00instruments':1 '04':9 'chopin':5,8 'classical':2 'frederic':4 'instruments':11 'of':7 'prerock':10 'the':6 'unsorted':3
                                    'search_combo'  '00instruments':13 '04':21 'c':3A 'chopin':8B,12C,17,20 'classical':14 'frederic':6B,7B,16 'in':2A 'instruments':23 'minor':5A 'of':11C,19 'prerock':22 'sharp':4A 'the':9C,18 'unsorted':15 'waltz':1A 'world':10C
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  1A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-4', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-1', 'Q-HAP-2', 'Q-PLAY-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['instrumental', 'polish', 'piano', 'romantic', 'classical']
                                        'tag_date'  1932
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1637329808.2201464  (2021-11-19 14:50:08)
                             'size'  3502360