======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '177'
                                          'artist'  'Richard Tauber'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  "One Day When We Were Young (strauss - ' Great Waltz ')"
                                           '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-2', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['austrian', 'myhits', 'myhitparade', 'classical', 'tenor']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1938'
                                        'comments'  ''
                                           'genre'  'prerock-vocal-opera'
                                             'bpm'  '145.6'
                                             'key'  '3B'
                                        '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))                     '145.6'
'TCON' (Content type, a.k.a. Genre)                 'prerock-vocal-opera'
'TDRC' (Recording time)                             '1938'
'TIT2' (Title/songname/content description)         "One Day When We Were Young (strauss - ' Great Waltz ')"
'TKEY' (Initial key)                                '3B'
'TLEN' (Length)                                     '177000'
'TPE1' (Lead performer(s)/Soloist(s))               'Richard Tauber'
'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'                                   ['austrian', 'myhits', 'myhitparade', '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'                        '+4.05 dB'
'TXXX:replaygain_track_peak'                        '0.455312'

========================== row from database ==========================
                                              'id'  1513805
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1938/Richard Tauber - One Day When We Were Young (Strauss - _ Great Waltz _) 1938.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  177
                                           'genre'  prerock-vocal-opera
                                        'filesize'  3594742
                                           'mtime'  1621625741
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1938 (Strauss _ _) 1938 prerock vocal opera
                                      'tag_artist'  Richard Tauber
                                     'tag_release'  None
                                       'tag_title'  One Day When We Were Young (strauss - ' Great Waltz ')
                                             'bpm'  145.6
                                    'search_title'  'day':2 'great':9 'one':1 'strauss':7,8 'waltz':10 'we':4 'were':5 'when':3 'young':6
                                   'search_artist'  'richard':1 'tauber':2
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '1938':6 'country':4 'exotica':2 'jazz':1 'oldies':3 'opera':11 'prerock':9 'strauss':7,8 'vocal':10
                                    'search_combo'  '00oldiepop':17 '1938':18 'country':16 'day':2A 'exotica':14 'great':9A 'jazz':13 'oldies':15 'one':1A 'opera':23 'prerock':21 'richard':11B 'strauss':7A,8A,19,20 'tauber':12B 'vocal':22 'waltz':10A 'we':4A 'were':5A 'when':3A 'young':6A
                                    'tag_tracknum'  None
                                      'num_images'  1
                                             'key'  3B
                                           '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-2', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['austrian', 'myhits', 'myhitparade', 'classical', 'tenor']
                                        'tag_date'  1938
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621625740.6821697  (2021-05-21 21:35:40)
                             'size'  3594742