======================== unified (from filesystem) ========================
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                                      'lastfmtags'  "['free jazz', 'productivity', 'jazz', 'gtd', 'audiobook']"
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======================== rawer (from filesystem) ========================

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'TCON' (Content type, a.k.a. Genre)                 'nonmusic-speech-instruction'
'TDRC' (Recording time)                             '2002'
'TIT2' (Title/songname/content description)         'Another way to clear your mind'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               'David Allen'
'TRCK' (Track number/Position in set)               '4/10'
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'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['progressive house', 'electronic']
'TXXX:lastfmtags'                                   ['free jazz', 'productivity', 'jazz', 'gtd', 'audiobook']
'TXXX:q-bass'                                       '1'
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'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '1'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.44 dB'
'TXXX:replaygain_track_peak'                        '0.591549'

========================== row from database ==========================
                                              'id'  461063
                                            'path'  /data/Music/Bulk/0nonmusic/Getting Things Done Fast/GTDFast05 - 04 - Another way to clear your mind.mp3
                                         'working'  None
                                         'bitrate'  64
                                    'duration_sec'  333
                                           'genre'  nonmusic-speech-instruction
                                        'filesize'  2671539
                                           'mtime'  1620562196
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                                        'rest_str'   0nonmusic GTDFast05 04 nonmusic speech instruction
                                      'tag_artist'  David Allen
                                     'tag_release'  Getting Things Done Fast (Disc 5)
                                       'tag_title'  Another way to clear your mind
                                             'bpm'  141.216
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                                   'search_artist'  'allen':2 'david':1
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                                     'search_rest'  '0nonmusic':1 'gtdfast05':2 'instruction':5 'nonmusic':3 'speech':4
                                    'search_combo'  '0nonmusic':17 '5':15C,16C 'allen':8B 'another':1A 'clear':4A 'david':7B 'disc':13C,14C 'done':11C 'fast':12C 'getting':9C 'gtdfast05':18 'instruction':21 'mind':6A 'nonmusic':19 'speech':20 'things':10C 'to':3A 'way':2A 'your':5A
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  1A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['free jazz', 'productivity', 'jazz', 'gtd', 'audiobook']
                                        'tag_date'  2002
                                     'discogstags'  ['progressive house', 'electronic']

============================== file details ==============================
                                           'mtime'  1620562195.576211  (2021-05-09 14:09:55)
                             'size'  2671539