======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '172'
                                          'artist'  'Mrs Jack Hylton And Her Band'
                                     'text_people'  ''
                                         'release'  'Crown  167'
                                           'title'  'Alone (vocal - Mrs Jack Hylton = Ennis Parkes)'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-3', 'q-busy-2', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1936'
                                        'comments'  ''
                                           'genre'  'prerock-unsorted'
                                             'bpm'  '127.927'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Crown  167'
'TBPM' (BPM (beats per minute))                     '127.927'
'TCON' (Content type, a.k.a. Genre)                 'prerock-unsorted'
'TDRC' (Recording time)                             '1936'
'TIT2' (Title/songname/content description)         'Alone (vocal - Mrs Jack Hylton = Ennis Parkes)'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Mrs Jack Hylton And Her Band'
'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:q-bass'                                       '3'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'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'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.93 dB'
'TXXX:replaygain_track_peak'                        '0.543818'

========================== row from database ==========================
                                              'id'  1447862
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1936/Mrs Jack Hylton and her Band – Alone (vocal - Mrs Jack Hylton = Ennis Parkes) 23-3-1936.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  172
                                           'genre'  prerock-unsorted
                                        'filesize'  3458883
                                           'mtime'  1621697996
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1936 her – 23 3 1936 prerock unsorted
                                      'tag_artist'  Mrs Jack Hylton And Her Band
                                     'tag_release'  Crown  167
                                       'tag_title'  Alone (vocal - Mrs Jack Hylton = Ennis Parkes)
                                             'bpm'  127.927
                                    'search_title'  'alone':1 'ennis':7 'hylton':6 'jack':5 'mrs':4 'parkes':8,9 'vocal':2,3
                                   'search_artist'  'and':4 'band':6 'her':5 'hylton':3 'jack':2 'mrs':1
                                  'search_release'  '167':2 'crown':1
                                     'search_rest'  '00oldiepop':5 '1936':6 '23':8 '3':9 'country':4 'exotica':2 'her':7 'jazz':1 'oldies':3 'prerock':10 'unsorted':11
                                    'search_combo'  '00oldiepop':22 '167':17C '1936':23 '23':25 '3':26 'alone':1A 'and':13B 'band':15B 'country':21 'crown':16C 'ennis':7A 'exotica':19 'her':14B,24 'hylton':6A,12B 'jack':5A,11B 'jazz':18 'mrs':4A,10B 'oldies':20 'parkes':8A,9A 'prerock':27 'unsorted':28 'vocal':2A,3A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-4', 'Q-HAP-3', 'q-bass-3', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1936
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621697995.8910072  (2021-05-22 17:39:55)
                             'size'  3458883