======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '198'
                                          'artist'  'John McCormack'
                                     'text_people'  ''
                                         'release'  '[non-album tracks]'
                                           'title'  'Oh Sleep Why Dost Thou Leave Me'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-LOCALNESS-3', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['irish folk', 'celtic', 'classical', 'tenor']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1920'
                                        'comments'  ''
                                           'genre'  'prerock-vocal-folk'
                                             'bpm'  '120.042'
                                             'key'  '12B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     '[non-album tracks]'
'TBPM' (BPM (beats per minute))                     '120.042'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal-folk'
'TDRC' (Recording time)                             '1920'
'TIT2' (Title/songname/content description)         'Oh Sleep Why Dost Thou Leave Me'
'TKEY' (Initial key)                                '12B'
'TPE1' (Lead performer(s)/Soloist(s))               'John McCormack'
'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'                                   ['irish folk', 'celtic', 'classical', 'tenor']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'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'                        '+3.33 dB'
'TXXX:replaygain_track_peak'                        '0.591504'

========================== row from database ==========================
                                              'id'  1452218
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1920/John McCormack - Oh Sleep Why Dost Thou Leave Me 1-4-1920.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  198
                                           'genre'  prerock-vocal-folk
                                        'filesize'  3975018
                                           'mtime'  1621625677
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1920 1 4 1920 prerock vocal folk
                                      'tag_artist'  John McCormack
                                     'tag_release'  [non-album tracks]
                                       'tag_title'  Oh Sleep Why Dost Thou Leave Me
                                             'bpm'  120.042
                                    'search_title'  'dost':4 'leave':6 'me':7 'oh':1 'sleep':2 'thou':5 'why':3
                                   'search_artist'  'cormack':4 'john':1 'mc':3 'mccormack':2
                                  'search_release'  'album':2 'non':1 'nonalbum':3 'tracks':4,5
                                     'search_rest'  '00oldiepop':5 '1':7 '1920':6 '4':8 'country':4 'exotica':2 'folk':11 'jazz':1 'oldies':3 'prerock':9 'vocal':10
                                    'search_combo'  '00oldiepop':21 '1':23 '1920':22 '4':24 'album':13C 'cormack':11B 'country':20 'dost':4A 'exotica':18 'folk':27 'jazz':17 'john':8B 'leave':6A 'mc':10B 'mccormack':9B 'me':7A 'non':12C 'nonalbum':14C 'oh':1A 'oldies':19 'prerock':25 'sleep':2A 'thou':5A 'tracks':15C,16C 'vocal':26 'why':3A
                                    '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-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-2', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['irish folk', 'celtic', 'classical', 'tenor']
                                        'tag_date'  1920
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621625676.8648756  (2021-05-21 21:34:36)
                             'size'  3975018