======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '224'
                                          'artist'  'Mario Lanza'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Serenade Student Prince'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-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'  "['opera', 'classic', 'classical', 'tenor']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1955'
                                        'comments'  ''
                                           'genre'  'prerock-opera'
                                             'bpm'  '136.092'
                                             'key'  '2A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '136.092'
'TCON' (Content type, a.k.a. Genre)                 'prerock-opera'
'TDRC' (Recording time)                             '1955'
'TIT2' (Title/songname/content description)         'Serenade Student Prince'
'TKEY' (Initial key)                                '2A'
'TPE1' (Lead performer(s)/Soloist(s))               'Mario Lanza'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['opera', 'classic', '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'                        '+0.66 dB'
'TXXX:replaygain_track_peak'                        '0.470801'

========================== row from database ==========================
                                              'id'  1429662
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1955/Mario Lanza - Serenade Student Prince 22-4-1955.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  224
                                           'genre'  prerock-opera
                                        'filesize'  4486848
                                           'mtime'  1620526275
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1955 22 4 1955 prerock opera
                                      'tag_artist'  Mario Lanza
                                     'tag_release'  None
                                       'tag_title'  Serenade Student Prince
                                             'bpm'  136.092
                                    'search_title'  'prince':3 'serenade':1 'student':2
                                   'search_artist'  'lanza':2 'mario':1
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '1955':6 '22':7 '4':8 'country':4 'exotica':2 'jazz':1 'oldies':3 'opera':10 'prerock':9
                                    'search_combo'  '00oldiepop':10 '1955':11 '22':12 '4':13 'country':9 'exotica':7 'jazz':6 'lanza':5B 'mario':4B 'oldies':8 'opera':15 'prerock':14 'prince':3A 'serenade':1A 'student':2A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  2A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', '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'  ['opera', 'classic', 'classical', 'tenor']
                                        'tag_date'  1955
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620526275.3817172  (2021-05-09 04:11:15)
                             'size'  4486848