======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '200'
                                          'artist'  'Jack Hylton'
                                     'text_people'  ''
                                         'release'  'HMV BD-5054'
                                           'title'  'Fancy Meeting You, with intro Choo Choo (v Ronnie Hill)'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-3', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['big band', '1920s', 'jazz', 'oldies', 'swing']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1936'
                                        'comments'  ''
                                           'genre'  'prerock-band'
                                             'bpm'  '132.444'
                                             'key'  '8A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'HMV BD-5054'
'TBPM' (BPM (beats per minute))                     '132.444'
'TCON' (Content type, a.k.a. Genre)                 'prerock-band'
'TDRC' (Recording time)                             '1936'
'TIT2' (Title/songname/content description)         'Fancy Meeting You, with intro Choo Choo (v Ronnie Hill)'
'TKEY' (Initial key)                                '8A'
'TPE1' (Lead performer(s)/Soloist(s))               'Jack Hylton'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['big band', '1920s', 'jazz', 'oldies', 'swing']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.04 dB'
'TXXX:replaygain_track_peak'                        '0.555475'

========================== row from database ==========================
                                              'id'  1427834
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1936/Jack Hylton - Fancy Meeting You, with intro Choo Choo (v Ronnie Hill) 28-3-1936.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  200
                                           'genre'  prerock-band
                                        'filesize'  4017970
                                           'mtime'  1620560473
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1936 28 3 1936 prerock band
                                      'tag_artist'  Jack Hylton
                                     'tag_release'  HMV BD-5054
                                       'tag_title'  Fancy Meeting You, with intro Choo Choo (v Ronnie Hill)
                                             'bpm'  132.444
                                    'search_title'  'choo':7 'fancy':1 'hill':11,12 'intro':6 'meeting':2 'ronnie':10 'v':8,9 'with':5 'you':3,4
                                   'search_artist'  'hylton':2 'jack':1
                                  'search_release'  '5054':3 'bd':2 'bd5054':4 'hmv':1
                                     'search_rest'  '00oldiepop':5 '1936':6 '28':7 '3':8 'band':10 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':9
                                    'search_combo'  '00oldiepop':23 '1936':24 '28':25 '3':26 '5054':17C 'band':28 'bd':16C 'bd5054':18C 'choo':7A 'country':22 'exotica':20 'fancy':1A 'hill':11A,12A 'hmv':15C 'hylton':14B 'intro':6A 'jack':13B 'jazz':19 'meeting':2A 'oldies':21 'prerock':27 'ronnie':10A 'v':8A,9A 'with':5A 'you':3A,4A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  8A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-3', 'q-grit-1']
                                      'lastfmtags'  ['big band', '1920s', 'jazz', 'oldies', 'swing']
                                        'tag_date'  1936
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620560473.4870708  (2021-05-09 13:41:13)
                             'size'  4017970