======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '166'
                                          'artist'  'Hank Williams'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  "I'm So Lonesome I Could Cry"
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-3', '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-2', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['country', 'singer songwriter', 'americana', 'folk', 'classic country']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1949'
                                        'comments'  ''
                                           'genre'  'prerock-country'
                                             'bpm'  '111.028'
                                             'key'  '12B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '111.028'
'TCON' (Content type, a.k.a. Genre)                 'prerock-country'
'TDRC' (Recording time)                             '1949'
'TIT2' (Title/songname/content description)         "I'm So Lonesome I Could Cry"
'TKEY' (Initial key)                                '12B'
'TPE1' (Lead performer(s)/Soloist(s))               'Hank Williams'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['country', 'singer songwriter', 'americana', 'folk', 'classic country']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '2'
'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'                        '+0.89 dB'
'TXXX:replaygain_track_peak'                        '0.664961'

========================== row from database ==========================
                                              'id'  1514662
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1949/Hank Williams - I_m So Lonesome I Could Cry 30-8-1949.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  166
                                           'genre'  prerock-country
                                        'filesize'  3338142
                                           'mtime'  1621627658
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1949 I_m 30 8 1949 prerock country
                                      'tag_artist'  Hank Williams
                                     'tag_release'  None
                                       'tag_title'  I'm So Lonesome I Could Cry
                                             'bpm'  111.028
                                    'search_title'  'could':7 'cry':8 'i':1,6 'im':3 'lonesome':5 'm':2 'so':4
                                   'search_artist'  'hank':1 'williams':2
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '1949':6 '30':9 '8':10 'country':4 'exotica':2 'i':7 'jazz':1 'm':8 'oldies':3 'prerock':11
                                    'search_combo'  '00oldiepop':15 '1949':16 '30':19 '8':20 'could':7A 'country':14 'cry':8A 'exotica':12 'hank':9B 'i':1A,6A,17 'im':3A 'jazz':11 'lonesome':5A 'm':2A,18 'oldies':13 'prerock':21 'so':4A 'williams':10B
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  12B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-2', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-3', 'q-grit-1']
                                      'lastfmtags'  ['country', 'singer songwriter', 'americana', 'folk', 'classic country']
                                        'tag_date'  1949
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621627658.2865288  (2021-05-21 22:07:38)
                             'size'  3338142