======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '725'
                                          'artist'  'Amir Kats'
                                     'text_people'  'Schubert, Franz'
                                         'release'  'Nodame Cantabile Best100'
                                           'title'  'Piano Sonata #16 in A minor, D845 - 1st Movement'
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                                      'lastfmtags'  "['piano', 'classical piano', 'classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  '12'
                                            'date'  '2005'
                                        'comments'  ''
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                                             'bpm'  '143.1'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

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'TBPM' (BPM (beats per minute))                     '143.1'
'TCMP'                                              '1'
'TCOM' (Composer)                                   'Schubert, Franz'
'TCON' (Content type, a.k.a. Genre)                 ['prerock-classical or classical instruments', 'soundtrack-video']
'TDRC' (Recording time)                             '2005'
'TENC' (Encoded by)                                 'iTunes v7.0.2.16'
'TIT2' (Title/songname/content description)         'Piano Sonata #16 in A minor, D845 - 1st Movement'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Amir Kats'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '7/8'
'TRCK' (Track number/Position in set)               '4/12'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '4'
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'TXXX:q-other'                                      '2'
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'TXXX:q-vocals'                                     '1'
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'TXXX:replaygain_track_peak'                        '0.890103'

========================== row from database ==========================
                                              'id'  431860
                                            'path'  /data/Music/Bulk/00instruments-classical/Compilations/Nodame Cantabile Best100/7-04 Piano Sonata #16 in A minor, D845 - 1st Movement.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  725
                                           'genre'  prerock-classical or classical instruments;soundtrack-video
                                        'filesize'  17449274
                                           'mtime'  1637329783
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                                        'rest_str'   00instruments classical Compilations 7 04 prerock classical classical instruments;soundtrack video
                                      'tag_artist'  Amir Kats
                                     'tag_release'  Nodame Cantabile Best100
                                       'tag_title'  Piano Sonata #16 in A minor, D845 - 1st Movement
                                             'bpm'  143.1
                                    'search_title'  '16':3,4 '1st':10 'a':6 'd845':9 'in':5 'minor':7,8 'movement':11 'piano':1 'sonata':2
                                   'search_artist'  'amir':1 'kats':2
                                  'search_release'  'best100':3 'cantabile':2 'nodame':1
                                     'search_rest'  '00instruments':1 '7':4 'classical':2 'compilations':3 'instruments':6,8 'prerock':5 'soundtrack':7,9 'video':10
                                    'search_combo'  '00instruments':17 '16':3A,4A '1st':10A '7':20 'a':6A 'amir':12B 'best100':16C 'cantabile':15C 'classical':18 'compilations':19 'd845':9A 'in':5A 'instruments':22,24 'kats':13B 'minor':7A,8A 'movement':11A 'nodame':14C 'piano':1A 'prerock':21 'sonata':2A 'soundtrack':23,25 'video':26
                                    'tag_tracknum'  4
                                      'num_images'  1
                                             'key'  8A
                                           '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-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-2', 'Q-HAP-2', 'Q-PLAY-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['piano', 'classical piano', 'classical']
                                        'tag_date'  2005
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1637329782.8179526  (2021-11-19 14:49:42)
                             'size'  17449274