======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '134'
                                          'artist'  'Chet Atkins'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  "Big D (from 'the Most Happy Fella')"
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-LOCALNESS-3', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-4', 'q-busy-2', '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'  "['instrumental', 'guitar virtuoso', 'country', 'jazz', 'guitar', 'acoustic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1956'
                                        'comments'  ''
                                           'genre'  'prerock-country'
                                             'bpm'  '115.261'
                                             'key'  '10A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '115.261'
'TCON' (Content type, a.k.a. Genre)                 'prerock-country'
'TDRC' (Recording time)                             '1956'
'TIT2' (Title/songname/content description)         "Big D (from 'the Most Happy Fella')"
'TKEY' (Initial key)                                '10A'
'TPE1' (Lead performer(s)/Soloist(s))               'Chet Atkins'
'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'                                   ['instrumental', 'guitar virtuoso', 'country', 'jazz', 'guitar', 'acoustic']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '2'
'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'                        '+0.46 dB'
'TXXX:replaygain_track_peak'                        '0.462605'

========================== row from database ==========================
                                              'id'  1519708
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1956/Chet Atkins - Big D (from _The Most Happy Fella_) 1956.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  134
                                           'genre'  prerock-country
                                        'filesize'  2686770
                                           'mtime'  1621627894
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1956 _The Fella_) 1956 prerock country
                                      'tag_artist'  Chet Atkins
                                     'tag_release'  None
                                       'tag_title'  Big D (from 'the Most Happy Fella')
                                             'bpm'  115.261
                                    'search_title'  'big':1 'd':2 'fella':9,10 'from':3,4 'happy':8 'most':7 'the':5,6
                                   'search_artist'  'atkins':2 'chet':1
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '1956':6 'country':4 'exotica':2 'fella':8,9 'jazz':1 'oldies':3 'prerock':10 'the':7
                                    'search_combo'  '00oldiepop':17 '1956':18 'atkins':12B 'big':1A 'chet':11B 'country':16 'd':2A 'exotica':14 'fella':9A,10A,20,21 'from':3A,4A 'happy':8A 'jazz':13 'most':7A 'oldies':15 'prerock':22 'the':5A,6A,19
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  10A
                                           '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-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-1']
                                      'lastfmtags'  ['instrumental', 'guitar virtuoso', 'country', 'jazz', 'guitar', 'acoustic']
                                        'tag_date'  1956
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621627894.0840545  (2021-05-21 22:11:34)
                             'size'  2686770