======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '168'
                                          'artist'  'Bing Crosby'
                                     'text_people'  ''
                                         'release'  'Vol.1 In Hollywood'
                                           'title'  'Learn To Croon'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-2', 'Q-LOCALNESS-2', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-4', 'q-drums-1', 'q-other-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['crooners', 'jazz', 'christmas', 'oldies', 'swing']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '12'
                                      'tracktotal'  ''
                                            'date'  '1930'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-soft-swing'
                                             'bpm'  '140.238'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Vol.1 In Hollywood'
'TBPM' (BPM (beats per minute))                     '140.238'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-soft-swing'
'TDRC' (Recording time)                             '1930'
'TIT2' (Title/songname/content description)         'Learn To Croon'
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Bing Crosby'
'TRCK' (Track number/Position in set)               '12'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['crooners', 'jazz', 'christmas', 'oldies', 'swing']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.61 dB'
'TXXX:replaygain_track_peak'                        '0.537888'

========================== row from database ==========================
                                              'id'  764339
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/vol.1 in hollywood (1930-34) - 128kb/12 - Learn To Croon.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  168
                                           'genre'  prerock-jb-jazz-soft-swing
                                        'filesize'  2697236
                                           'mtime'  1620538263
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country vol.1 hollywood (1930 34) 128kb 12 prerock jb jazz soft swing
                                      'tag_artist'  Bing Crosby
                                     'tag_release'  Vol.1 In Hollywood
                                       'tag_title'  Learn To Croon
                                             'bpm'  140.238
                                    'search_title'  'croon':3 'learn':1 'to':2
                                   'search_artist'  'bing':1 'crosby':2
                                  'search_release'  '1':2 'hollywood':5 'in':4 'vol':1 'vol1':3
                                     'search_rest'  '1':6 '128kb':13 '1930':9,10 '34':11,12 'country':4 'exotica':2 'hollywood':8 'jazz':1 'jb':15 'oldies':3 'prerock':14 'soft':16 'swing':17 'vol':5 'vol1':7
                                    'search_combo'  '1':7C,16 '128kb':23 '1930':19,20 '34':21,22 'bing':4B 'country':14 'croon':3A 'crosby':5B 'exotica':12 'hollywood':10C,18 'in':9C 'jazz':11 'jb':25 'learn':1A 'oldies':13 'prerock':24 'soft':26 'swing':27 'to':2A 'vol':6C,15 'vol1':8C,17
                                    'tag_tracknum'  12
                                      'num_images'  0
                                             'key'  10A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-4', 'q-other-2', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['crooners', 'jazz', 'christmas', 'oldies', 'swing']
                                        'tag_date'  1930
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620538263.4146523  (2021-05-09 07:31:03)
                             'size'  2697236