======================== unified (from filesystem) ========================
                                         'bitrate'  '128.0'
                                        'duration'  '590'
                                          'artist'  'Mahler'
                                     'text_people'  ''
                                         'release'  'Mahler (klassiek) - Das Lied v'
                                           'title'  'Sir Georg Solti - royal Concer'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-2', 'q-play-2', "
 "'q-chart-3', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['classical', 'romantic', 'austrian', 'composers', 'instrumental']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '145.5'
                                             'key'  '7A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Mahler (klassiek) - Das Lied v'
'TBPM' (BPM (beats per minute))                     '145.5'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TIT2' (Title/songname/content description)         'Sir Georg Solti - royal Concer'
'TKEY' (Initial key)                                '7A'
'TPE1' (Lead performer(s)/Soloist(s))               'Mahler'
'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'                                   ['classical', 'romantic', 'austrian', 'composers', 'instrumental']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+4.86 dB'
'TXXX:replaygain_track_peak'                        '0.847910'

========================== row from database ==========================
                                              'id'  1213813
                                            'path'  /data/Music/Bulk/00instruments-classical/Mahler/Das Lied von der Erde/Sir Georg Solti - royal Concertgebouw Orchestra - Gustav Mahler - Das Lied von der Erde - II Der Einsame im Herbst.mp3
                                         'working'  None
                                         'bitrate'  128
                                    'duration_sec'  590
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  9442344
                                           'mtime'  1620561638
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical von der Erde Concertgebouw Orchestra Gustav von der Erde II Der Einsame im Herbst prerock classical classical instruments
                                      'tag_artist'  Mahler
                                     'tag_release'  Mahler (klassiek) - Das Lied v
                                       'tag_title'  Sir Georg Solti - royal Concer
                                             'bpm'  145.5
                                    'search_title'  'concer':5 'georg':2 'royal':4 'sir':1 'solti':3
                                   'search_artist'  'mahler':1
                                  'search_release'  'das':4 'klassiek':2,3 'lied':5 'mahler':1 'v':6
                                     'search_rest'  '00instruments':1 'classical':2 'concertgebouw':6 'der':4 'einsame':10 'erde':5 'gustav':8 'herbst':12 'ii':9 'im':11 'instruments':14 'orchestra':7 'prerock':13 'von':3
                                    'search_combo'  '00instruments':13 'classical':14 'concer':5A 'concertgebouw':18 'das':10C 'der':16 'einsame':22 'erde':17 'georg':2A 'gustav':20 'herbst':24 'ii':21 'im':23 'instruments':26 'klassiek':8C,9C 'lied':11C 'mahler':6B,7C 'orchestra':19 'prerock':25 'royal':4A 'sir':1A 'solti':3A 'v':12C 'von':15
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  7A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['classical', 'romantic', 'austrian', 'composers', 'instrumental']
                                        'tag_date'  
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561637.7037747  (2021-05-09 14:00:37)
                             'size'  9442344