======================== unified (from filesystem) ========================
                                         'bitrate'  '155.917'
                                        'duration'  '1367'
                                          'artist'  'Pyotr Ilyich Tchaikovsky'
                                     'text_people'  ''
                                         'release'  'Klavierkonzerte Nr. 1 op. 23 & Nr. 3 op. 75'
                                           'title'  'PianoConcert No.1 in B-min. op.23 - I. Allegro non troppo e molto maestoso'
                                           '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-1', 'q-play-3', "
 "'Q-PIANO-3', 'q-chart-3', 'q-drums-1', 'q-other-4', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['russian', 'composers', 'instrumental', 'romantic', 'classical']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  '1982'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '144.9'
                                             'key'  '4A'
                                        'acoustid'  ''
rest: ''

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

'MCDI' (Music CD identifier)                        MCDI(data=b'\x00*\x01\x04\x00\x10\x01\x00\x00\x00\x00 \x00\x10\x02\x00\x00\x01\x91\xce\x00\x10\x03\x00\x00\x02!\x8c\x00\x10\x04\x00\x00\x02\xa4\xab\x00\x10\xaa\x00\x00\x03\xe3W')
'TALB' (Album/Movie/Show title)                     'Klavierkonzerte Nr. 1 op. 23 & Nr. 3 op. 75'
'TBPM' (BPM (beats per minute))                     '144.9'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRL' (Release time)                               '1982'
'TENC' (Encoded by)                                 'Greg'
'TIT2' (Title/songname/content description)         'PianoConcert No.1 in B-min. op.23 - I. Allegro non troppo e molto maestoso'
'TKEY' (Initial key)                                '4A'
'TPE1' (Lead performer(s)/Soloist(s))               'Pyotr Ilyich Tchaikovsky'
'TRCK' (Track number/Position in set)               '1'
'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-PIANO'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['russian', 'composers', 'instrumental', 'romantic', 'classical']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.58 dB'
'TXXX:replaygain_track_peak'                        '0.870688'

========================== row from database ==========================
                                              'id'  1213700
                                            'path'  /data/Music/Bulk/00instruments-classical/Tchaikovski, P.I/Tchaikovski, P.I. - PianoConcert No.1 in B-min. op.23 - I. Allegro non troppo e molto maestoso.mp3
                                         'working'  None
                                         'bitrate'  155
                                    'duration_sec'  1367
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  26660940
                                           'mtime'  1620561799
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Tchaikovski, P.I Tchaikovski, P.I. prerock classical or classical instruments
                                      'tag_artist'  Pyotr Ilyich Tchaikovsky
                                     'tag_release'  Klavierkonzerte Nr. 1 op. 23 & Nr. 3 op. 75
                                       'tag_title'  PianoConcert No.1 in B-min. op.23 - I. Allegro non troppo e molto maestoso
                                             'bpm'  144.9
                                    'search_title'  '1':3 '23':10 'allegro':14 'b':6 'bmin':8 'concert':21 'e':17 'i':12,13 'in':5 'maestoso':19 'min':7 'molto':18 'no':2 'no1':4 'non':15 'op':9 'op23':11 'piano':20 'pianoconcert':1 'troppo':16
                                   'search_artist'  'ilyich':2 'pyotr':1 'tchaikovsky':3
                                  'search_release'  '1':4 '23':7 '3':8 '75':9 'klavierkonzerte':1 'nr':2,3 'op':5,6
                                     'search_rest'  '00instruments':1 'classical':2 'i':6,9 'instruments':12 'or':11 'p':5,8 'pi':7 'prerock':10 'tchaikovski':3,4
                                    'search_combo'  '00instruments':34 '1':3A,28C '23':10A,31C '3':32C '75':33C 'allegro':14A 'b':6A 'bmin':8A 'classical':35 'concert':21A 'e':17A 'i':12A,13A,39,42 'ilyich':23B 'in':5A 'instruments':45 'klavierkonzerte':25C 'maestoso':19A 'min':7A 'molto':18A 'no':2A 'no1':4A 'non':15A 'nr':26C,27C 'op':9A,29C,30C 'op23':11A 'or':44 'p':38,41 'pi':40 'piano':20A 'pianoconcert':1A 'prerock':43 'pyotr':22B 'tchaikovski':36,37 'tchaikovsky':24B 'troppo':16A
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  4A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-mixbeat-1', 'Q-PIANO-3', '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-1']
                                      'lastfmtags'  ['russian', 'composers', 'instrumental', 'romantic', 'classical']
                                        'tag_date'  1982
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561799.286085  (2021-05-09 14:03:19)
                             'size'  26660940