======================== unified (from filesystem) ========================
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                                        'duration'  '158'
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                            'musicbrainz_artistid'  ''
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                                     'tracknumber'  '20'
                                      'tracktotal'  '27'
                                            'date'  '1965'
                                        'comments'  ''
                                           'genre'  'rock-pop-surf'
                                             'bpm'  '88.3'
                                             'key'  '7B'
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rest: ''

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

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'TBPM' (BPM (beats per minute))                     '88.3'
'TCON' (Content type, a.k.a. Genre)                 'rock-pop-surf'
'TDRC' (Recording time)                             '1965'
'TENC' (Encoded by)                                 'iTunes 11.1.5.5'
'TIT2' (Title/songname/content description)         'The Growl'
'TKEY' (Initial key)                                '7B'
'TPE1' (Lead performer(s)/Soloist(s))               'Alan Pierce & The Tonekings'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '20/27'
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'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
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'TXXX:Q-UNU'                                        '1'
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========================== row from database ==========================
                                              'id'  1419977
                                            'path'  /data/Music/Bulk/00popandrock-punk-garage-surf-stoner/Bobby Gregg - va - Greaser Instrumentals Vol. 08/20 The Growl.mp3
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                                    'duration_sec'  158
                                           'genre'  rock-pop-surf
                                        'filesize'  3163027
                                           'mtime'  1620736915
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock punk garage surf stoner Bobby Gregg va 20 rock pop surf
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                                     'tag_release'  Greaser Instrumentals Vol. 08
                                       'tag_title'  The Growl
                                             'bpm'  88.3
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                                  'search_release'  'greaser':1 'instrumentals':2 'vol':3,4
                                     'search_rest'  '20':8 'bobby':5 'garage':2 'gregg':6 'pop':10 'punk':1 'rock':9 'stoner':4 'surf':3 'va':7
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                                    'tag_tracknum'  20
                                      'num_images'  0
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-2', 'q-chart-1', 'q-other-4', 'Q-HAP-3', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  1965
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620736915.034978  (2021-05-11 14:41:55)
                             'size'  3163027