======================== unified (from filesystem) ========================
                                         'bitrate'  '241.767'
                                        'duration'  '115'
                                          'artist'  'Dieterich Buxtehude'
                                     'text_people'  ''
                                         'release'  'Complete Harpsicord Music'
                                           'title'  '28 Suite In A, BuxWV 243-Courante'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-3', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['baroque', 'classical', 'organ', 'early music', 'german']"
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '28'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments;mi-harpsicord'
                                             'bpm'  '124.7'
                                             'key'  '5B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Complete Harpsicord Music'
'TBPM' (BPM (beats per minute))                     '124.7'
'TCON' (Content type, a.k.a. Genre)                 ['prerock-classical or classical instruments', 'mi-harpsicord']
'TIT2' (Title/songname/content description)         '28 Suite In A, BuxWV 243-Courante'
'TKEY' (Initial key)                                '5B'
'TPE1' (Lead performer(s)/Soloist(s))               'Dieterich Buxtehude'
'TRCK' (Track number/Position in set)               '28'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'classical'
'TXXX:lastfmtags'                                   ['baroque', 'classical', 'organ', 'early music', 'german']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.33 dB'
'TXXX:replaygain_track_peak'                        '0.588161'

========================== row from database ==========================
                                              'id'  345186
                                            'path'  /data/Music/Bulk/00instruments-classical/Harpsichord/28 Suite In A, BuxWV 243-Courante.mp3
                                         'working'  None
                                         'bitrate'  241
                                    'duration_sec'  115
                                           'genre'  prerock-classical or classical instruments;mi-harpsicord
                                        'filesize'  3486376
                                           'mtime'  1620528034
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Harpsichord prerock classical classical instruments;mi harpsicord
                                      'tag_artist'  Dieterich Buxtehude
                                     'tag_release'  Complete Harpsicord Music
                                       'tag_title'  28 Suite In A, BuxWV 243-Courante
                                             'bpm'  124.7
                                    'search_title'  '243':7 '243courante':9 '28':1 'a':4,5 'bux':10 'buxwv':6 'courante':8 'in':3 'suite':2 'wv':11
                                   'search_artist'  'buxtehude':2 'dieterich':1
                                  'search_release'  'complete':1 'harpsicord':2 'music':3
                                     'search_rest'  '00instruments':1 'classical':2 'harpsichord':3 'harpsicord':9 'instruments':5,7 'mi':6,8 'prerock':4
                                    'search_combo'  '00instruments':17 '243':7A '243courante':9A '28':1A 'a':4A,5A 'bux':10A 'buxtehude':13B 'buxwv':6A 'classical':18 'complete':14C 'courante':8A 'dieterich':12B 'harpsichord':19 'harpsicord':15C,25 'in':3A 'instruments':21,23 'mi':22,24 'music':16C 'prerock':20 'suite':2A 'wv':11A
                                    'tag_tracknum'  28
                                      'num_images'  0
                                             'key'  5B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['baroque', 'classical', 'organ', 'early music', 'german']
                                        'tag_date'  
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1620528033.6042159  (2021-05-09 04:40:33)
                             'size'  3486376