======================== unified (from filesystem) ========================
                                         'bitrate'  '185.473'
                                        'duration'  '351'
                                          'artist'  'Walter Gieseking'
                                     'text_people'  ''
                                         'release'  'Debussy Complete Works for Piano CD4'
                                           'title'  'Nocturne'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-LOCALNESS-3', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-3', "
 "'Q-PIANO-3', 'q-chart-2', 'q-drums-1', 'q-other-4', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  ("['french impressionism', 'impressionism', 'piano', 'lvb piano sonatas', "
 "'classical']")
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '11'
                                      'tracktotal'  ''
                                            'date'  '1995'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '141.9'
                                             'key'  '3A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Debussy Complete Works for Piano CD4'
'TBPM' (BPM (beats per minute))                     '141.9'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1995'
'TIT2' (Title/songname/content description)         'Nocturne'
'TKEY' (Initial key)                                '3A'
'TPE1' (Lead performer(s)/Soloist(s))               'Walter Gieseking'
'TRCK' (Track number/Position in set)               '11'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'classical'
'TXXX:lastfmtags'                                   ['french impressionism',
 'impressionism',
 'piano',
 'lvb piano sonatas',
 'classical']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.61 dB'
'TXXX:replaygain_track_peak'                        '0.848835'

========================== row from database ==========================
                                              'id'  1213846
                                            'path'  /data/Music/Bulk/00instruments-classical/Gieseking, Walter/11 - Nocturne.mp3
                                         'working'  None
                                         'bitrate'  185
                                    'duration_sec'  351
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  8142314
                                           'mtime'  1620574170
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Gieseking, 11 prerock classical classical instruments
                                      'tag_artist'  Walter Gieseking
                                     'tag_release'  Debussy Complete Works for Piano CD4
                                       'tag_title'  Nocturne
                                             'bpm'  141.9
                                    'search_title'  'nocturne':1
                                   'search_artist'  'gieseking':2 'walter':1
                                  'search_release'  'cd4':6 'complete':2 'debussy':1 'for':4 'piano':5 'works':3
                                     'search_rest'  '00instruments':1 'classical':2 'gieseking':3,4 'instruments':6 'prerock':5
                                    'search_combo'  '00instruments':10 'cd4':9C 'classical':11 'complete':5C 'debussy':4C 'for':7C 'gieseking':3B,12,13 'instruments':15 'nocturne':1A 'piano':8C 'prerock':14 'walter':2B 'works':6C
                                    'tag_tracknum'  11
                                      'num_images'  0
                                             'key'  3A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-3', 'q-mixbeat-1', 'Q-PIANO-3', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['french impressionism', 'impressionism', 'piano', 'lvb piano sonatas', 'classical']
                                        'tag_date'  1995
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1620574170.4632885  (2021-05-09 17:29:30)
                             'size'  8142314