======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '223'
                                          'artist'  '22 & Group'
                                     'text_people'  ''
                                         'release'  'Prison Songs (vol 1)'
                                           'title'  'Prettiest Train'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-2', 'Q-LOCALNESS-3', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-2', 'q-drums-1', 'q-other-1', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['world', 'choral', '40s', 'work songs', 'accapella']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '07'
                                      'tracktotal'  ''
                                            'date'  '1947'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted;loc-namerica'
                                             'bpm'  '144.955'
                                             'key'  '2A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Prison Songs (vol 1)'
'TBPM' (BPM (beats per minute))                     '144.955'
'TCON' (Content type, a.k.a. Genre)                 ['prerock-unsorted', 'loc-namerica']
'TDRC' (Recording time)                             '1947'
'TIT2' (Title/songname/content description)         'Prettiest Train'
'TKEY' (Initial key)                                '2A'
'TPE1' (Lead performer(s)/Soloist(s))               '22 & Group'
'TPE2' (Band/orchestra/accompaniment)               '22 & Group'
'TRCK' (Track number/Position in set)               '07'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['world', 'choral', '40s', 'work songs', 'accapella']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'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'                        '+2.45 dB'
'TXXX:replaygain_track_peak'                        '0.499928'

========================== row from database ==========================
                                              'id'  1119212
                                            'path'  /data/Music/Bulk/00localcharacter/01714 - Alan Lomax Prison Songs - Parchman Farm Vol.1 - Murderous Home/07 - 22 & Group - Prettiest Train.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  223
                                           'genre'  prerock-unsorted;loc-namerica
                                        'filesize'  3583872
                                           'mtime'  1621629600
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter 01714 Alan Lomax Parchman Farm Vol.1 Murderous Home 07 prerock unsorted;loc namerica
                                      'tag_artist'  22 & Group
                                     'tag_release'  Prison Songs (vol 1)
                                       'tag_title'  Prettiest Train
                                             'bpm'  144.955
                                    'search_title'  'prettiest':1 'train':2
                                   'search_artist'  '22':1 'group':2
                                  'search_release'  '1':5,6 'prison':1 'songs':2 'vol':3,4
                                     'search_rest'  '01714':1 '1':7 'alan':2 'farm':5 'home':10 'loc':13,15 'lomax':3 'murderous':9 'namerica':16 'parchman':4 'prerock':11 'unsorted':12,14 'vol':6 'vol1':8
                                    'search_combo'  '01714':11 '1':9C,10C,17 '22':3B 'alan':12 'farm':15 'group':4B 'home':20 'loc':23,25 'lomax':13 'murderous':19 'namerica':26 'parchman':14 'prerock':21 'prettiest':1A 'prison':5C 'songs':6C 'train':2A 'unsorted':22,24 'vol':7C,8C,16 'vol1':18
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  2A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-1', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['world', 'choral', '40s', 'work songs', 'accapella']
                                        'tag_date'  1947
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621629600.4522493  (2021-05-21 22:40:00)
                             'size'  3583872