======================== unified (from filesystem) ========================
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                                        'duration'  '46'
                                          'artist'  'Alexander Scriabin'
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                                           'title'  'Prelude Op. 11 No. 23  F major'
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                                      'lastfmtags'  "['russian', 'composer', 'piano', 'romantic', 'classical']"
                             'musicbrainz_albumid'  ''
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                            'musicbrainz_artistid'  ''
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                                      'tracktotal'  '21'
                                            'date'  '1993'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '137.4'
                                             'key'  '8B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Romantic Piano Music (Disk 2)'
'TBPM' (BPM (beats per minute))                     '137.4'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1993'
'TIT2' (Title/songname/content description)         'Prelude Op. 11 No. 23  F major'
'TKEY' (Initial key)                                '8B'
'TPE1' (Lead performer(s)/Soloist(s))               'Alexander Scriabin'
'TRCK' (Track number/Position in set)               '15/21'
'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'                        '+0.84 dB'
'TXXX:replaygain_track_peak'                        '0.582658'

========================== row from database ==========================
                                              'id'  264798
                                            'path'  /data/Music/Bulk/00instruments-classical/Alexander Scriabin/Romantic Piano Music (Disk 2)/15 Prelude Op. 11 No. 23  F major.mp3
                                         'working'  None
                                         'bitrate'  256
                                    'duration_sec'  46
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  1479541
                                           'mtime'  1621853298
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical 15 prerock classical classical instruments
                                      'tag_artist'  Alexander Scriabin
                                     'tag_release'  Romantic Piano Music (Disk 2)
                                       'tag_title'  Prelude Op. 11 No. 23  F major
                                             'bpm'  137.4
                                    'search_title'  '23':6 'f':7 'major':8 'no':4,5 'op':2,3 'prelude':1
                                   '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':18 '2':16C,17C '23':6A 'alexander':9B 'classical':19 'disk':14C,15C 'f':7A 'instruments':21 'major':8A 'music':13C 'no':4A,5A 'op':2A,3A 'piano':12C 'prelude':1A 'prerock':20 'romantic':11C 'scriabin':10B
                                    'tag_tracknum'  15
                                      'num_images'  0
                                             'key'  8B
                                           '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'  1621853297.6007605  (2021-05-24 12:48:17)
                             'size'  1479541