======================== unified (from filesystem) ========================
                                         'bitrate'  '222.383'
                                        'duration'  '429'
                                          'artist'  'Wagner'
                                     'text_people'  ''
                                         'release'  'The Ride of the Valkyries (Overtures and Choruses)'
                                           'title'  'Tristan and Isolde: Mild und leise (Liebestod)'
                                           '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-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-3', 'q-drums-2', 'q-other-4', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['classical', 'opera', 'romantic', 'german', 'composers']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '4'
                                      'tracktotal'  '10'
                                            'date'  '1998'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '130.819'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Ride of the Valkyries (Overtures and Choruses)'
'TBPM' (BPM (beats per minute))                     '130.819'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '1998'
'TIT2' (Title/songname/content description)         'Tristan and Isolde: Mild und leise (Liebestod)'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               'Richard Wagner'
'TPE2' (Band/orchestra/accompaniment)               'Wagner'
'TRCK' (Track number/Position in set)               '4/10'
'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'                                   ['classical', 'opera', 'romantic', 'german', 'composers']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'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'                                     '2'
'TXXX:replaygain_track_gain'                        '+2.64 dB'
'TXXX:replaygain_track_peak'                        '0.603329'

========================== row from database ==========================
                                              'id'  1284513
                                            'path'  /data/Music/Bulk/00instruments-classical/Wagner - The Ride of the Valkyries (V0)/04 Tristan and Isolde_ Mild und leise (Liebestod).mp3
                                         'working'  None
                                         'bitrate'  222
                                    'duration_sec'  429
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  11935546
                                           'mtime'  1620561889
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical (V0) 04 Isolde_ prerock classical classical instruments
                                      'tag_artist'  Wagner
                                     'tag_release'  The Ride of the Valkyries (Overtures and Choruses)
                                       'tag_title'  Tristan and Isolde: Mild und leise (Liebestod)
                                             'bpm'  130.819
                                    'search_title'  'and':2 'isolde':3,4 'leise':7 'liebestod':8,9 'mild':5 'tristan':1 'und':6
                                   'search_artist'  'wagner':1
                                  'search_release'  'and':7 'choruses':8,9 'of':3 'overtures':5,6 'ride':2 'the':1 'valkyries':4
                                     'search_rest'  '00instruments':1 'classical':2 'instruments':7 'isolde':5 'prerock':6 'v0':3,4
                                    'search_combo'  '00instruments':20 'and':2A,17C 'choruses':18C,19C 'classical':21 'instruments':26 'isolde':3A,4A,24 'leise':7A 'liebestod':8A,9A 'mild':5A 'of':13C 'overtures':15C,16C 'prerock':25 'ride':12C 'the':11C 'tristan':1A 'und':6A 'v0':22,23 'valkyries':14C 'wagner':10B
                                    'tag_tracknum'  4
                                      'num_images'  0
                                             'key'  1A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-1', 'q-chart-3', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['classical', 'opera', 'romantic', 'german', 'composers']
                                        'tag_date'  1998
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561888.6041095  (2021-05-09 14:04:48)
                             'size'  11935546