======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '112'
                                          'artist'  'Richard Strauss'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Also Sprach Zarthrustra'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-2', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-2', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['german', 'opera', 'post romantic', 'romantic', 'classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '135.0'
                                             'key'  '8B'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '135.0'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TIT2' (Title/songname/content description)         'Also Sprach Zarthrustra'
'TKEY' (Initial key)                                '8B'
'TPE1' (Lead performer(s)/Soloist(s))               'Richard Strauss'
'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'                                   ['german', 'opera', 'post romantic', 'romantic', 'classical']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.93 dB'
'TXXX:replaygain_track_peak'                        '0.481179'

========================== row from database ==========================
                                              'id'  1213769
                                            'path'  /data/Music/Bulk/00instruments-classical/Strauss/Strauss, Richard - Also Sprach Zarathustra (Excerpt).mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  112
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  1800307
                                           'mtime'  1620561799
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Strauss, Zarathustra (Excerpt) prerock classical or classical instruments
                                      'tag_artist'  Richard Strauss
                                     'tag_release'  None
                                       'tag_title'  Also Sprach Zarthrustra
                                             'bpm'  135.0
                                    'search_title'  'also':1 'sprach':2 'zarthrustra':3
                                   'search_artist'  'richard':1 'strauss':2
                                  'search_release'  
                                     'search_rest'  '00instruments':1 'classical':2 'excerpt':6,7 'instruments':10 'or':9 'prerock':8 'strauss':3,4 'zarathustra':5
                                    'search_combo'  '00instruments':6 'also':1A 'classical':7 'excerpt':11,12 'instruments':15 'or':14 'prerock':13 'richard':4B 'sprach':2A 'strauss':5B,8,9 'zarathustra':10 'zarthrustra':3A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  8B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-2', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['german', 'opera', 'post romantic', 'romantic', 'classical']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561799.1586478  (2021-05-09 14:03:19)
                             'size'  1800307