======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '152'
                                          'artist'  'Robert Garden u. s. Tango-Orchester'
                                     'text_people'  'G. Narciso'
                                         'release'  'tango in europe'
                                           'title'  'Mi ricordo'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-2', 'Q-UNU-2', 'Q-LOCALNESS-3', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-4', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1938'
                                        'comments'  ''
                                           'genre'  'loc-style-tango or milonga'
                                             'bpm'  '119.546'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'tango in europe'
'TBPM' (BPM (beats per minute))                     '119.546'
'TCOM' (Composer)                                   'G. Narciso'
'TCON' (Content type, a.k.a. Genre)                 'loc-style-tango or milonga'
'TDRC' (Recording time)                             '1938'
'TIT2' (Title/songname/content description)         'Mi ricordo'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Robert Garden u. s. Tango-Orchester'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '2'
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '-0.20 dB'
'TXXX:replaygain_track_peak'                        '0.694982'

========================== row from database ==========================
                                              'id'  851390
                                            'path'  /data/Music/Bulk/00localcharacter/tango in europe (various)/Robert Gaden Tango-Orchester - Mi ricordo (1938).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  152
                                           'genre'  loc-style-tango or milonga
                                        'filesize'  2449199
                                           'mtime'  1620528491
                                   'redo_metaread'  0
                                        'rest_str'   00localcharacter (various) Gaden (1938) loc style milonga
                                      'tag_artist'  Robert Garden u. s. Tango-Orchester
                                     'tag_release'  tango in europe
                                       'tag_title'  Mi ricordo
                                             'bpm'  119.546
                                    'search_title'  'mi':1 'ricordo':2
                                   'search_artist'  'garden':2 'orchester':8 'robert':1 's':5,6 'tango':7 'tangoorchester':9 'u':3,4
                                  'search_release'  'europe':3 'in':2 'tango':1
                                     'search_rest'  '1938':4,5 'gaden':3 'loc':6 'milonga':8 'style':7 'various':1,2
                                    'search_combo'  '1938':18,19 'europe':14C 'gaden':17 'garden':4B 'in':13C 'loc':20 'mi':1A 'milonga':22 'orchester':10B 'ricordo':2A 'robert':3B 's':7B,8B 'style':21 'tango':9B,12C 'tangoorchester':11B 'u':5B,6B 'various':15,16
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-2', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-4', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1938
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620528490.957472  (2021-05-09 04:48:10)
                             'size'  2449199