======================== unified (from filesystem) ========================
                                         'bitrate'  '214.322'
                                        'duration'  '172'
                                          'artist'  'FM3'
                                     'text_people'  ''
                                         'release'  '后觀音'
                                           'title'  'µL'
                                           'quals'  ("['Q-HAP-2', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', "
 "'Q-OLDST-3', 'q-syn-3', 'q-bass-1', 'q-busy-1', 'q-grit-1', 'q-play-3', "
 "'q-chart-1', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['minimalism', 'drone', 'china', 'minimal', 'ambient']"
                                     'discogstags'  "['electronic']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '5'
                                      'tracktotal'  ''
                                            'date'  '2006'
                                        'comments'  ''
                                           'genre'  'set-pl-buddhamachine'
                                             'bpm'  '130.3'
                                             'key'  '11B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     '后觀音'
'TBPM' (BPM (beats per minute))                     '130.3'
'TCON' (Content type, a.k.a. Genre)                 'set-pl-buddhamachine'
'TDRC' (Recording time)                             '2006'
'TENC' (Encoded by)                                 'iTunes v7.0.1'
'TIT2' (Title/songname/content description)         'µL'
'TKEY' (Initial key)                                '11B'
'TPE1' (Lead performer(s)/Soloist(s))               'FM3'
'TPUB' (Publisher)                                  'Lona Recor (ALIVE)'
'TRCK' (Track number/Position in set)               '5'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:Style'                                        'Acoustic, Musique Concrète, Free Improvisation, Experimental, Ambient'
'TXXX:discogstags'                                  'electronic'
'TXXX:iTunes_CDDB_IDs'                              '11+6542EECF94C33AC401B14D5A9E4C8E32+7718343'
'TXXX:lastfmtags'                                   ['minimalism', 'drone', 'china', 'minimal', 'ambient']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '1'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '3'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+1.15 dB'
'TXXX:replaygain_track_peak'                        '0.981772'

========================== row from database ==========================
                                              'id'  940955
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/Buddha Machine/FM3BuddhaMachine/Hou Guan Yin/FM3 - Hou Guan Yin - 05 - µL.mp3
                                         'working'  None
                                         'bitrate'  214
                                    'duration_sec'  172
                                           'genre'  set-pl-buddhamachine
                                        'filesize'  4651019
                                           'mtime'  1637785104
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm Buddha Machine FM3BuddhaMachine Hou Guan Yin Hou Guan Yin 05 set pl buddhamachine
                                      'tag_artist'  FM3
                                     'tag_release'  后觀音
                                       'tag_title'  µL
                                             'bpm'  130.3
                                    'search_title'  'l':4 'm':3 'ml':2 'µl':1
                                   'search_artist'  'fm3':1
                                  'search_release'  '后觀音':1
                                     'search_rest'  'buddha':1 'buddhamachine':9 'fm3buddha':10 'fm3buddhamachine':3 'guan':5 'hou':4 'machine':2 'pl':8 'set':7 'yin':6
                                    'search_combo'  'buddha':7 'buddhamachine':15 'fm3':5B 'fm3buddha':16 'fm3buddhamachine':9 'guan':11 'hou':10 'l':4A 'm':3A 'machine':8 'ml':2A 'pl':14 'set':13 'yin':12 'µl':1A '后觀音':6C
                                    'tag_tracknum'  5
                                      'num_images'  1
                                             'key'  11B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-1', 'q-drums-1', 'q-syn-3', 'q-chart-1', 'q-other-4', 'Q-HAP-2', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['minimalism', 'drone', 'china', 'minimal', 'ambient']
                                        'tag_date'  2006
                                     'discogstags'  ['electronic']

============================== file details ==============================
                                           'mtime'  1637785104.0723321  (2021-11-24 21:18:24)
                             'size'  4651019