======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '270'
                                          'artist'  'The Crusaders'
                                     'text_people'  ''
                                         'release'  '2nd Crusade'
                                           'title'  "Ain't Gon' Change A Thang"
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', 'Q-UNU-1', 'Q-JZFKS-4', "
 "'Q-OLDST-2', 'q-syn-2', 'q-bass-4', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-2', 'q-drums-4', 'q-other-3', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['fusion', 'jazz', 'jazz funk', 'funk', 'soul']"
                                     'discogstags'  "['funk / soul']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  ''
                                            'date'  '1972'
                                        'comments'  ''
                                           'genre'  'funk or soul-funk'
                                             'bpm'  '94.591'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     '2nd Crusade'
'TBPM' (BPM (beats per minute))                     '94.591'
'TCON' (Content type, a.k.a. Genre)                 'funk or soul-funk'
'TDRC' (Recording time)                             '1972'
'TIT2' (Title/songname/content description)         "Ain't Gon' Change A Thang"
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'The Crusaders'
'TRCK' (Track number/Position in set)               '7'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '4'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  'funk / soul'
'TXXX:lastfmtags'                                   ['fusion', 'jazz', 'jazz funk', 'funk', 'soul']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '4'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-0.14 dB'
'TXXX:replaygain_track_peak'                        '0.784512'

========================== row from database ==========================
                                              'id'  1504503
                                            'path'  /data/Music/Bulk/00popandrock-swing-funk-soul/Crusaders, the/[1972] 2nd Crusade/The Crusaders - Ain_t Gon_ Change A Thang - 07.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  270
                                           'genre'  funk or soul-funk
                                        'filesize'  6494498
                                           'mtime'  1620665599
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock swing funk soul Crusaders, the [1972] Ain_t Gon_ 07 funk or soul funk
                                      'tag_artist'  The Crusaders
                                     'tag_release'  2nd Crusade
                                       'tag_title'  Ain't Gon' Change A Thang
                                             'bpm'  94.591
                                    'search_title'  'a':7 'ain':1 'aint':3 'change':6 'gon':4,5 't':2 'thang':8
                                   'search_artist'  'crusaders':2 'the':1
                                  'search_release'  '2nd':1 'crusade':2
                                     'search_rest'  '1972':7,8 'ain':9 'crusaders':4,5 'funk':2 'gon':11 'or':12 'soul':3 'swing':1 't':10 'the':6
                                    'search_combo'  '1972':19,20 '2nd':11C 'a':7A 'ain':1A,21 'aint':3A 'change':6A 'crusade':12C 'crusaders':10B,16,17 'funk':14 'gon':4A,5A,23 'or':24 'soul':15 'swing':13 't':2A,22 'thang':8A 'the':9B,18
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  8A
                                           '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-4', 'q-busy-2', 'q-drums-4', 'q-syn-2', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['fusion', 'jazz', 'jazz funk', 'funk', 'soul']
                                        'tag_date'  1972
                                     'discogstags'  ['funk / soul']

============================== file details ==============================
                                           'mtime'  1620665599.2061098  (2021-05-10 18:53:19)
                             'size'  6494498