======================== unified (from filesystem) ========================
                                         'bitrate'  '182.172'
                                        'duration'  '71'
                                          'artist'  'Kronos Quartet'
                                     'text_people'  ''
                                         'release'  'String Quartets'
                                           'title'  ' String Quartet No. 5 - I'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
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 "'q-chart-3', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  ("['contemporary classical', 'instrumental', 'string quartet', 'soundtrack', "
 "'classical']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '142.7'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'String Quartets'
'TBPM' (BPM (beats per minute))                     '142.7'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TIT2' (Title/songname/content description)         ' String Quartet No. 5 - I'
'TKEY' (Initial key)                                '7B'
'TPE1' (Lead performer(s)/Soloist(s))               'Kronos Quartet'
'TPE2' (Band/orchestra/accompaniment)               'Kronos Quartet'
'TXXX:Encoder'                                      'MPEGPlus (Stream 7, Profile Unknown)'
'TXXX:Fmps_playcount'                               '1'
'TXXX:Fmps_rating'                                  '0.6'
'TXXX:Fmps_rating_amarok_score'                     '0.07'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['contemporary classical',
 'instrumental',
 'string quartet',
 'soundtrack',
 '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'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.92 dB'
'TXXX:replaygain_track_peak'                        '0.600338'

========================== row from database ==========================
                                              'id'  1110006
                                            'path'  /data/Music/Bulk/00instruments-classical/Unsorted/Philip Glass - String Quartets (Kronos Quartet)__01. [Philip Glass] String Quartet No. 5 - I.mp3
                                         'working'  None
                                         'bitrate'  182
                                    'duration_sec'  71
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  1638864
                                           'mtime'  1620561860
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Unsorted Philip Glass (Kronos Quartet)__01. [Philip Glass] prerock classical or classical instruments
                                      'tag_artist'  Kronos Quartet
                                     'tag_release'  String Quartets
                                       'tag_title'   String Quartet No. 5 - I
                                             'bpm'  142.7
                                    'search_title'  '5':5 'i':6 'no':3,4 'quartet':2 'string':1
                                   'search_artist'  'kronos':1 'quartet':2
                                  'search_release'  'quartets':2 'string':1
                                     'search_rest'  '00instruments':1 '01':9,11 'classical':2 'glass':5,13 'instruments':16 'kronos':6,7 'or':15 'philip':4,12 'prerock':14 'quartet':8,10 'unsorted':3
                                    'search_combo'  '00instruments':11 '01':19,21 '5':5A 'classical':12 'glass':15,23 'i':6A 'instruments':26 'kronos':7B,16,17 'no':3A,4A 'or':25 'philip':14,22 'prerock':24 'quartet':2A,8B,18,20 'quartets':10C 'string':1A,9C 'unsorted':13
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['contemporary classical', 'instrumental', 'string quartet', 'soundtrack', 'classical']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561859.5204308  (2021-05-09 14:04:19)
                             'size'  1638864