======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '333'
                                          'artist'  'Machinefabriek'
                                     'text_people'  ''
                                         'release'  'Perform Dauw '
                                           'title'  'Dauw - Original Version'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-2', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-2', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['noise', 'electronic', 'drone', 'experimental', 'ambient']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '1'
                                      'tracktotal'  ''
                                            'date'  '2009'
                                        'comments'  ''
                                           'genre'  'prerock-classical or classical instruments'
                                             'bpm'  '145.059'
                                             'key'  '5A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Perform Dauw '
'TBPM' (BPM (beats per minute))                     '145.059'
'TCON' (Content type, a.k.a. Genre)                 'prerock-classical or classical instruments'
'TDRC' (Recording time)                             '2009'
'TIT2' (Title/songname/content description)         'Dauw - Original Version'
'TKEY' (Initial key)                                '5A'
'TPE1' (Lead performer(s)/Soloist(s))               'Machinefabriek'
'TRCK' (Track number/Position in set)               '1'
'TXXX:PERFORMER'                                    'machinefabriek'
'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'                                   ['noise', 'electronic', 'drone', 'experimental', 'ambient']
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'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'                                     '2'
'TXXX:replaygain_track_gain'                        '+1.04 dB'
'TXXX:replaygain_track_peak'                        '0.595574'

========================== row from database ==========================
                                              'id'  205172
                                            'path'  /data/Music/Bulk/00instruments-classical/Nils Frahm/2009 - Dauw (& Machinefabriek)/01 - Dauw - Original Version.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  333
                                           'genre'  prerock-classical or classical instruments
                                        'filesize'  13332293
                                           'mtime'  1620561685
                                   'redo_metaread'  0
                                        'rest_str'   00instruments classical Nils Frahm 2009 (& Machinefabriek) 01 prerock classical classical instruments
                                      'tag_artist'  Machinefabriek
                                     'tag_release'  Perform Dauw 
                                       'tag_title'  Dauw - Original Version
                                             'bpm'  145.059
                                    'search_title'  'dauw':1 'original':2 'version':3
                                   'search_artist'  'machinefabriek':1
                                  'search_release'  'dauw':2 'perform':1
                                     'search_rest'  '00instruments':1 '2009':5 'classical':2 'frahm':4 'instruments':9 'machinefabriek':6,7 'nils':3 'prerock':8
                                    'search_combo'  '00instruments':7 '2009':11 'classical':8 'dauw':1A,6C 'frahm':10 'instruments':15 'machinefabriek':4B,12,13 'nils':9 'original':2A 'perform':5C 'prerock':14 'version':3A
                                    'tag_tracknum'  1
                                      'num_images'  0
                                             'key'  5A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-2', '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-2', 'q-other-4', 'Q-HAP-3', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  ['noise', 'electronic', 'drone', 'experimental', 'ambient']
                                        'tag_date'  2009
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620561685.0027938  (2021-05-09 14:01:25)
                             'size'  13332293