======================== unified (from filesystem) ========================
                                         'bitrate'  '153.304'
                                        'duration'  '369'
                                          'artist'  'Wolfgang Amadeus Mozart'
                                     'text_people'  ''
                                         'release'  'Klassiek voor een Zomeravond'
                                           'title'  'Romance - from Eine Kleine Nachtmusik'
                                           '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-3', "
 "'q-chart-3', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['instrumental', 'composers', 'piano', 'classical', 'classic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  ''
                                            'date'  '1993'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '142.6'
                                             'key'  '8B'
                                        'acoustid'  ''
rest: ''

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

'COMM:Comment:XXX'                                  'Noors Kamerorkest, Iona Brown'
'MCDI' (Music CD identifier)                        MCDI(data=b"\x00z\x01\x0e\x00\x10\x01\x00\x00\x00\x00!\x00\x10\x02\x00\x00\x00eh\x00\x10\x03\x00\x00\x00\xdf\xaa\x00\x10\x04\x00\x00\x01.\x15\x00\x10\x05\x00\x00\x01\x8fw\x00\x10\x06\x00\x00\x01\xd6\xad\x00\x10\x07\x00\x00\x02cM\x00\x10\x08\x00\x00\x02\xd0\xc6\x00\x10\t\x00\x00\x03>\xb4\x00\x10\n\x00\x00\x03u\xd0\x00\x10\x0b\x00\x00\x03\xe6\x82\x00\x10\x0c\x00\x00\x04/\xfc\x00\x10\r\x00\x00\x04\x7f'\x00\x10\x0e\x00\x00\x04\xee\xec\x00\x10\xaa\x00\x00\x05IZ")
'TALB' (Album/Movie/Show title)                     'Klassiek voor een Zomeravond'
'TBPM' (BPM (beats per minute))                     '142.6'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRL' (Release time)                               '1993'
'TENC' (Encoded by)                                 'Greg'
'TIT2' (Title/songname/content description)         'Romance - from Eine Kleine Nachtmusik'
'TKEY' (Initial key)                                '8B'
'TPE1' (Lead performer(s)/Soloist(s))               'Wolfgang Amadeus Mozart'
'TRCK' (Track number/Position in set)               '7'
'TSSE' (Software/Hardware and settings used for encoding)  'Audiograbber 1.80, LAME dll 3.92, VBR 3, Stereo, High quality'
'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'                                   ['instrumental', 'composers', 'piano', 'classical', 'classic']
'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'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+9.52 dB'
'TXXX:replaygain_track_peak'                        '0.847244'

========================== row from database ==========================
                                              'id'  1214409
                                            'path'  /data/Music/Bulk/00instruments-classical/Mozart/Mozart - 07 - Romance - from Eine Kleine Nachtmusik.mp3
                                         'working'  None
                                         'bitrate'  153
                                    'duration_sec'  369
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  7093321
                                           'mtime'  1620561661
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical 07 prerock classical classical instruments
                                      'tag_artist'  Wolfgang Amadeus Mozart
                                     'tag_release'  Klassiek voor een Zomeravond
                                       'tag_title'  Romance - from Eine Kleine Nachtmusik
                                             'bpm'  142.6
                                    'search_title'  'eine':3 'from':2 'kleine':4 'nachtmusik':5 'romance':1
                                   'search_artist'  'amadeus':2 'mozart':3 'wolfgang':1
                                  'search_release'  'een':3 'klassiek':1 'voor':2 'zomeravond':4
                                     'search_rest'  '00instruments':1 'classical':2 'instruments':4 'prerock':3
                                    'search_combo'  '00instruments':13 'amadeus':7B 'classical':14 'een':11C 'eine':3A 'from':2A 'instruments':16 'klassiek':9C 'kleine':4A 'mozart':8B 'nachtmusik':5A 'prerock':15 'romance':1A 'voor':10C 'wolfgang':6B 'zomeravond':12C
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  8B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', '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'  ['instrumental', 'composers', 'piano', 'classical', 'classic']
                                        'tag_date'  1993
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561660.6763759  (2021-05-09 14:01:00)
                             'size'  7093321