======================== unified (from filesystem) ========================
                                         'bitrate'  '250.235'
                                        'duration'  '58'
                                          'artist'  'Dieterich Buxtehude'
                                     'text_people'  ''
                                         'release'  'Complete Harpsicord Music'
                                           'title'  'More Palatino, BuxWV 247-Variatio 2'
                                           '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-PIANO-3', 'q-chart-3', 'q-drums-1', 'q-other-4', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['baroque', 'classical', 'organ', 'early music', 'german']"
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '02'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments;mi-harpsicord'
                                             'bpm'  '97.0'
                                             'key'  '2A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Complete Harpsicord Music'
'TBPM' (BPM (beats per minute))                     '97.0'
'TCON' (Content type, a.k.a. Genre)                 ['prerock-classical or classical instruments', 'mi-harpsicord']
'TIT2' (Title/songname/content description)         'More Palatino, BuxWV 247-Variatio 2'
'TKEY' (Initial key)                                '2A'
'TPE1' (Lead performer(s)/Soloist(s))               'Dieterich Buxtehude'
'TRCK' (Track number/Position in set)               '02'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '3'
'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-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.11 dB'
'TXXX:replaygain_track_peak'                        '0.557162'

========================== row from database ==========================
                                              'id'  340495
                                            'path'  /data/Music/Bulk/00instruments-classical/Harpsichord/02 Aria - More Palatino, BuxWV 247-Variatio 2.mp3
                                         'working'  None
                                         'bitrate'  250
                                    'duration_sec'  58
                                           'genre'  prerock-classical or classical instruments;mi-harpsicord
                                        'filesize'  1831234
                                           'mtime'  1620528016
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Harpsichord 02 Aria prerock classical classical instruments;mi harpsicord
                                      'tag_artist'  Dieterich Buxtehude
                                     'tag_release'  Complete Harpsicord Music
                                       'tag_title'  More Palatino, BuxWV 247-Variatio 2
                                             'bpm'  97.0
                                    'search_title'  '2':8 '247':5 '247variatio':7 'bux':9 'buxwv':4 'more':1 'palatino':2,3 'variatio':6 'wv':10
                                   'search_artist'  'buxtehude':2 'dieterich':1
                                  'search_release'  'complete':1 'harpsicord':2 'music':3
                                     'search_rest'  '00instruments':1 'aria':4 'classical':2 'harpsichord':3 'harpsicord':10 'instruments':6,8 'mi':7,9 'prerock':5
                                    'search_combo'  '00instruments':16 '2':8A '247':5A '247variatio':7A 'aria':19 'bux':9A 'buxtehude':12B 'buxwv':4A 'classical':17 'complete':13C 'dieterich':11B 'harpsichord':18 'harpsicord':14C,25 'instruments':21,23 'mi':22,24 'more':1A 'music':15C 'palatino':2A,3A 'prerock':20 'variatio':6A 'wv':10A
                                    'tag_tracknum'  2
                                      'num_images'  0
                                             'key'  2A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-2', 'q-mixbeat-1', 'Q-PIANO-3', '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'  1620528015.758697  (2021-05-09 04:40:15)
                             'size'  1831234