======================== unified (from filesystem) ========================
                                         'bitrate'  '256.0'
                                        'duration'  '136'
                                          'artist'  'Alexander Scriabin'
                                     'text_people'  ''
                                         'release'  'Romantic Piano Music (Disk 2)'
                                           'title'  'Etudes Op. 8 No. 12 D sharp minor'
                                           'quals'  ("['Q-HAP-2', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'Q-PLAY-3', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', "
 "'Q-PIANO-4', 'q-chart-3', 'q-drums-1', 'q-other-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['russian', 'composer', 'piano', 'romantic', 'classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  '21'
                                            'date'  '1993'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '96.8'
                                             'key'  '2A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Romantic Piano Music (Disk 2)'
'TBPM' (BPM (beats per minute))                     '96.8'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1993'
'TIT2' (Title/songname/content description)         'Etudes Op. 8 No. 12 D sharp minor'
'TKEY' (Initial key)                                '2A'
'TPE1' (Lead performer(s)/Soloist(s))               'Alexander Scriabin'
'TRCK' (Track number/Position in set)               '7/21'
'TSSE' (Software/Hardware and settings used for encoding)  'Audiograbber 1.83.01, LAME dll 3.97, 256 Kbit/s, Joint Stereo, Normal quality'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['russian', 'composer', 'piano', 'romantic', 'classical']
'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'                                      '1'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.78 dB'
'TXXX:replaygain_track_peak'                        '0.694420'

========================== row from database ==========================
                                              'id'  432958
                                            'path'  /data/Music/Bulk/00instruments-classical/Alexander Scriabin/Romantic Piano Music (Disk 2)/07 Etudes Op. 8 No. 12 D sharp minor.mp3
                                         'working'  None
                                         'bitrate'  256
                                    'duration_sec'  136
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  4355103
                                           'mtime'  1621853295
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical 07 prerock classical classical instruments
                                      'tag_artist'  Alexander Scriabin
                                     'tag_release'  Romantic Piano Music (Disk 2)
                                       'tag_title'  Etudes Op. 8 No. 12 D sharp minor
                                             'bpm'  96.8
                                    'search_title'  '8':4 'd':7 'etudes':1 'minor':9 'no':5,6 'op':2,3 'sharp':8
                                   'search_artist'  'alexander':1 'scriabin':2
                                  'search_release'  '2':6,7 'disk':4,5 'music':3 'piano':2 'romantic':1
                                     'search_rest'  '00instruments':1 'classical':2 'instruments':4 'prerock':3
                                    'search_combo'  '00instruments':19 '2':17C,18C '8':4A 'alexander':10B 'classical':20 'd':7A 'disk':15C,16C 'etudes':1A 'instruments':22 'minor':9A 'music':14C 'no':5A,6A 'op':2A,3A 'piano':13C 'prerock':21 'romantic':12C 'scriabin':11B 'sharp':8A
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  2A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-4', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-1', 'Q-HAP-2', 'Q-PLAY-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['russian', 'composer', 'piano', 'romantic', 'classical']
                                        'tag_date'  1993
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621853294.8576834  (2021-05-24 12:48:14)
                             'size'  4355103