======================== unified (from filesystem) ========================
                                         'bitrate'  '256.0'
                                        'duration'  '128'
                                          'artist'  'Frederic Chopin'
                                     'text_people'  ''
                                         'release'  'Romantic Piano Music (Disk 2)'
                                           'title'  'Waltz, Valse Op. 64,1 D flat major (Minute Waltz)'
                                           'quals'  ("['Q-HAP-2', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
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 "'Q-PIANO-4', 'q-chart-3', 'q-drums-1', 'q-other-1', 'q-vocals-1', "
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                                      'lastfmtags'  "['classical', 'piano', 'romantic', 'polish', 'instrumental']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  '21'
                                            'date'  '1993'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '144.1'
                                             'key'  '4B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Romantic Piano Music (Disk 2)'
'TBPM' (BPM (beats per minute))                     '144.1'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1993'
'TIT2' (Title/songname/content description)         'Waltz, Valse Op. 64,1 D flat major (Minute Waltz)'
'TKEY' (Initial key)                                '4B'
'TPE1' (Lead performer(s)/Soloist(s))               'Frederic Chopin'
'TRCK' (Track number/Position in set)               '3/21'
'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'                                   ['classical', 'piano', 'romantic', 'polish', 'instrumental']
'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'                        '+1.32 dB'
'TXXX:replaygain_track_peak'                        '0.693038'

========================== row from database ==========================
                                              'id'  410108
                                            'path'  /data/Music/Bulk/00instruments-classical/Chopin/Romantic Piano Music (Disk 2)/03 Waltz, Valse Op. 64,1 D flat major (Minute Waltz).mp3
                                         'working'  None
                                         'bitrate'  256
                                    'duration_sec'  128
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  4100150
                                           'mtime'  1637329781
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical 03 prerock classical classical instruments
                                      'tag_artist'  Frederic Chopin
                                     'tag_release'  Romantic Piano Music (Disk 2)
                                       'tag_title'  Waltz, Valse Op. 64,1 D flat major (Minute Waltz)
                                             'bpm'  144.1
                                    'search_title'  '1':7,9 '64':6,8 'd':10 'flat':11 'major':12 'minute':13,14 'op':4,5 'valse':3 'waltz':1,2
                                   'search_artist'  'chopin':2 'frederic':1
                                  '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':24 '1':7A,9A '2':22C,23C '64':6A,8A 'chopin':16B 'classical':25 'd':10A 'disk':20C,21C 'flat':11A 'frederic':15B 'instruments':27 'major':12A 'minute':13A,14A 'music':19C 'op':4A,5A 'piano':18C 'prerock':26 'romantic':17C 'valse':3A 'waltz':1A,2A
                                    'tag_tracknum'  3
                                      'num_images'  0
                                             'key'  4B
                                           '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'  ['classical', 'piano', 'romantic', 'polish', 'instrumental']
                                        'tag_date'  1993
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1637329781.0127509  (2021-11-19 14:49:41)
                             'size'  4100150