======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '130'
                                          'artist'  'The Who'
                                     'text_people'  ''
                                         'release'  "Who's Next (disc 1)"
                                           'title'  "Love Ain't for Keeping"
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-2', 'q-syn-2', 'q-bass-4', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-4', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-2']")
                                      'lastfmtags'  "['hard rock', 'rock', '60s', 'british', 'classic rock']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  ''
                                            'date'  '2003'
                                        'comments'  ''
                                           'genre'  'rock-cppex-classic'
                                             'bpm'  '145.895'
                                             'key'  '10B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     "Who's Next (disc 1)"
'TBPM' (BPM (beats per minute))                     '145.895'
'TCON' (Content type, a.k.a. Genre)                 'rock-cppex-classic'
'TDRC' (Recording time)                             '2003'
'TIT2' (Title/songname/content description)         "Love Ain't for Keeping"
'TKEY' (Initial key)                                '10B'
'TPE1' (Lead performer(s)/Soloist(s))               'The Who'
'TRCK' (Track number/Position in set)               '3'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['hard rock', 'rock', '60s', 'british', 'classic rock']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '2'
'TXXX:replaygain_track_gain'                        '-1.79 dB'
'TXXX:replaygain_track_peak'                        '0.451972'

========================== row from database ==========================
                                              'id'  1530358
                                            'path'  /data/Music/Bulk/00poprockelectronic/album top 1000/0235 The Who - Who_s Next/CD1/Who_s Next (disc 1)-03-Love Ain_t for Keeping.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  130
                                           'genre'  rock-cppex-classic
                                        'filesize'  3143222
                                           'mtime'  1636039364
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic album top 1000 0235 Who_s CD1 Who_s 03 Ain_t rock cppex classic
                                      'tag_artist'  The Who
                                     'tag_release'  Who's Next (disc 1)
                                       'tag_title'  Love Ain't for Keeping
                                             'bpm'  145.895
                                    'search_title'  'ain':2 'aint':4 'for':5 'keeping':6 'love':1 't':3
                                   'search_artist'  'the':1 'who':2
                                  'search_release'  '1':7,8 'disc':5,6 'next':4 's':2 'who':1 'whos':3
                                     'search_rest'  '00poprockelectronic':1 '0235':5 '1000':4 'ain':9 'album':2 'cd1':8 'classic':13 'cppex':12 'rock':11 's':7 't':10 'top':3 'who':6
                                    'search_combo'  '00poprockelectronic':17 '0235':21 '1':15C,16C '1000':20 'ain':2A,25 'aint':4A 'album':18 'cd1':24 'classic':29 'cppex':28 'disc':13C,14C 'for':5A 'keeping':6A 'love':1A 'next':12C 'rock':27 's':10C,23 't':3A,26 'the':7B 'top':19 'who':8B,9C,22 'whos':11C
                                    'tag_tracknum'  3
                                      'num_images'  0
                                             'key'  10B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-2', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-2', 'q-syn-2', 'q-chart-4', 'q-other-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['hard rock', 'rock', '60s', 'british', 'classic rock']
                                        'tag_date'  2003
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1636039364.2385314  (2021-11-04 16:22:44)
                             'size'  3143222