======================== unified (from filesystem) ========================
                                         'bitrate'  '166.06'
                                        'duration'  '263'
                                          'artist'  'Felix Mendelssohn Bartholdy'
                                     'text_people'  ''
                                         'release'  'Welt der Symphonie'
                                           'title'  'Ein Sommernachtstraum op. 61 - 1. Scherzo. Allegro vivace'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'q-syn-1', 'q-bass-1', "
 "'q-busy-2', 'q-grit-2', 'q-play-3', 'Q-OLDST-1', 'q-chart-3', 'q-drums-1', "
 "'q-other-4', 'q-piano-1', 'q-vocals-1', 'Q-HHRNBTT-1', 'q-mixbeat-1']")
                                      'lastfmtags'  "['classical', 'romantic', 'german', 'composers', 'piano']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '133.8'
                                             'key'  '7A'
                                        'acoustid'  ''
rest: ''

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

'MCDI' (Music CD identifier)                        MCDI(data=b'\x00:\x01\x06\x00\x10\x01\x00\x00\x00\x00\x00\x00\x10\x02\x00\x00\x01\x08\x12\x00\x10\x03\x00\x00\x01\xd3\xcd\x00\x10\x04\x00\x00\x02"\x15\x00\x10\x05\x00\x00\x02rB\x00\x10\x06\x00\x00\x03\x19E\x00\x10\xaa\x00\x00\x04+\x19')
'TALB' (Album/Movie/Show title)                     'Welt der Symphonie'
'TBPM' (BPM (beats per minute))                     '133.8'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TENC' (Encoded by)                                 'Greg'
'TIT2' (Title/songname/content description)         'Ein Sommernachtstraum op. 61 - 1. Scherzo. Allegro vivace'
'TKEY' (Initial key)                                '7A'
'TPE1' (Lead performer(s)/Soloist(s))               'Felix Mendelssohn Bartholdy'
'TRCK' (Track number/Position in set)               '3'
'TSSE' (Software/Hardware and settings used for encoding)  'Audiograbber 1.80, LAME dll 3.92, VBR 3, Stereo, High quality'
'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'                                   ['classical', 'romantic', 'german', 'composers', 'piano']
'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'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+4.04 dB'
'TXXX:replaygain_track_peak'                        '0.981132'

========================== row from database ==========================
                                              'id'  1213735
                                            'path'  /data/Music/Bulk/00instruments-classical/Welt der Symphonie/Felix Mendelssohn Bartholdy - 03 - Ein Sommernachtstraum op. 61 - 1. Scherzo. Allegro vivace.mp3
                                         'working'  None
                                         'bitrate'  166
                                    'duration_sec'  263
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  5481879
                                           'mtime'  1620561889
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical 03 prerock classical or classical instruments
                                      'tag_artist'  Felix Mendelssohn Bartholdy
                                     'tag_release'  Welt der Symphonie
                                       'tag_title'  Ein Sommernachtstraum op. 61 - 1. Scherzo. Allegro vivace
                                             'bpm'  133.8
                                    'search_title'  '1':6,7 '61':5 'allegro':10 'ein':1 'op':3,4 'scherzo':8,9 'sommernachtstraum':2 'vivace':11
                                   'search_artist'  'bartholdy':3 'felix':1 'mendelssohn':2
                                  'search_release'  'der':2 'symphonie':3 'welt':1
                                     'search_rest'  '00instruments':1 'classical':2 'instruments':5 'or':4 'prerock':3
                                    'search_combo'  '00instruments':18 '1':6A,7A '61':5A 'allegro':10A 'bartholdy':14B 'classical':19 'der':16C 'ein':1A 'felix':12B 'instruments':22 'mendelssohn':13B 'op':3A,4A 'or':21 'prerock':20 'scherzo':8A,9A 'sommernachtstraum':2A 'symphonie':17C 'vivace':11A 'welt':15C
                                    'tag_tracknum'  3
                                      'num_images'  0
                                             'key'  7A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', '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'  ['classical', 'romantic', 'german', 'composers', 'piano']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561888.8416822  (2021-05-09 14:04:48)
                             'size'  5481879