======================== unified (from filesystem) ========================
                                         'bitrate'  '153.811'
                                        'duration'  '545'
                                          'artist'  'Ludwig Van Beethoven'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Romance No.2 voor Viool in F op.50'
                                           '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-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['instrumental', 'composers', 'romantic', 'classical', 'classic']"
                                     'discogstags'  "['classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '9'
                                      'tracktotal'  ''
                                            'date'  ''
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '145.1'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'MCDI' (Music CD identifier)                        MCDI(data=b"\x00r\x01\r\x00\x10\x01\x00\x00\x00\x00!\x00\x10\x02\x00\x00\x00@\xae\x00\x10\x03\x00\x00\x00\x91\xee\x00\x10\x04\x00\x00\x00\xf1\xc7\x00\x10\x05\x00\x00\x01Z\xef\x00\x10\x06\x00\x00\x01\x95\x17\x00\x10\x07\x00\x00\x01\xd7'\x00\x10\x08\x00\x00\x02\x1c\xcb\x00\x10\t\x00\x00\x02\xbf\xbb\x00\x10\n\x00\x00\x03`\x81\x00\x10\x0b\x00\x00\x03\xab\x8b\x00\x10\x0c\x00\x00\x04\x19\xba\x00\x10\r\x00\x00\x04S\xe9\x00\x10\xaa\x00\x00\x04\xccA")
'TBPM' (BPM (beats per minute))                     '145.1'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TENC' (Encoded by)                                 'Greg'
'TIT2' (Title/songname/content description)         'Romance No.2 voor Viool in F op.50'
'TKEY' (Initial key)                                '7B'
'TPE1' (Lead performer(s)/Soloist(s))               'Ludwig Van Beethoven'
'TRCK' (Track number/Position in set)               '9'
'TSSE' (Software/Hardware and settings used for encoding)  'Audiograbber 1.80, LAME dll 3.92, VBR 2, 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:discogstags'                                  'classical'
'TXXX:lastfmtags'                                   ['instrumental', 'composers', 'romantic', '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'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+2.27 dB'
'TXXX:replaygain_track_peak'                        '0.714929'

========================== row from database ==========================
                                              'id'  1214019
                                            'path'  /data/Music/Bulk/00instruments-classical/Beethoven/Beethoven, Ludwig von - Romance No.2 voor Viool in F op.50.mp3
                                         'working'  None
                                         'bitrate'  153
                                    'duration_sec'  545
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  10485632
                                           'mtime'  1620561471
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Beethoven, von prerock classical classical instruments
                                      'tag_artist'  Ludwig Van Beethoven
                                     'tag_release'  None
                                       'tag_title'  Romance No.2 voor Viool in F op.50
                                             'bpm'  145.1
                                    'search_title'  '2':3 '50':10 'f':8 'in':7 'no':2 'no2':4 'op':9 'op50':11 'romance':1 'viool':6 'voor':5
                                   'search_artist'  'beethoven':3 'ludwig':1 'van':2
                                  'search_release'  
                                     'search_rest'  '00instruments':1 'beethoven':3,4 'classical':2 'instruments':7 'prerock':6 'von':5
                                    'search_combo'  '00instruments':15 '2':3A '50':10A 'beethoven':14B,17,18 'classical':16 'f':8A 'in':7A 'instruments':21 'ludwig':12B 'no':2A 'no2':4A 'op':9A 'op50':11A 'prerock':20 'romance':1A 'van':13B 'viool':6A 'von':19 'voor':5A
                                    'tag_tracknum'  9
                                      'num_images'  0
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', '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'  ['instrumental', 'composers', 'romantic', 'classical', 'classic']
                                        'tag_date'  
                                     'discogstags'  ['classical']

============================== file details ==============================
                                           'mtime'  1620561470.9045184  (2021-05-09 13:57:50)
                             'size'  10485632