======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '172'
                                          'artist'  'Joseph Schmidt'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Ach So Fromm Ach So Traut (Flotow - Martha)'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-LOCALNESS-2', '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-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['opera', 'jewish', 'myhitparade', 'myhits', 'tenor']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1934'
                                        'comments'  ''
                                           'genre'  'prerock-vocal-opera'
                                             'bpm'  '138.7'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:MusicMatch_Bio:eng'                           'Sound edited by Breda4@hotmail.com'
'TBPM' (BPM (beats per minute))                     '138.7'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal-opera'
'TDRC' (Recording time)                             '1934-02'
'TIT2' (Title/songname/content description)         'Ach So Fromm Ach So Traut (Flotow - Martha)'
'TKEY' (Initial key)                                '7B'
'TLEN' (Length)                                     '172000'
'TPE1' (Lead performer(s)/Soloist(s))               'Joseph Schmidt'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['opera', 'jewish', 'myhitparade', 'myhits', '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'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.90 dB'
'TXXX:replaygain_track_peak'                        '0.553127'

========================== row from database ==========================
                                              'id'  1470063
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1934/Joseph Schmidt - Ach So Fromm Ach So Traut (Flotow - Martha) -2-1934.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  172
                                           'genre'  prerock-vocal-opera
                                        'filesize'  3499859
                                           'mtime'  1621625718
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1934 2 1934 prerock vocal opera
                                      'tag_artist'  Joseph Schmidt
                                     'tag_release'  None
                                       'tag_title'  Ach So Fromm Ach So Traut (Flotow - Martha)
                                             'bpm'  138.7
                                    'search_title'  'ach':1 'flotow':5,6 'fromm':3 'martha':7,8 'so':2 'traut':4
                                   'search_artist'  'joseph':1 'schmidt':2
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '1934':6 '2':7 'country':4 'exotica':2 'jazz':1 'oldies':3 'opera':10 'prerock':8 'vocal':9
                                    'search_combo'  '00oldiepop':15 '1934':16 '2':17 'ach':1A 'country':14 'exotica':12 'flotow':5A,6A 'fromm':3A 'jazz':11 'joseph':9B 'martha':7A,8A 'oldies':13 'opera':20 'prerock':18 'schmidt':10B 'so':2A 'traut':4A 'vocal':19
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  7B
                                           '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-1', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['opera', 'jewish', 'myhitparade', 'myhits', 'tenor']
                                        'tag_date'  1934
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621625718.4299428  (2021-05-21 21:35:18)
                             'size'  3499859