======================== unified (from filesystem) ========================
                                         'bitrate'  '165.126'
                                        'duration'  '257'
                                          'artist'  'Bill Withers'
                                     'text_people'  ''
                                         'release'  "Bill Withers' Greatest Hits"
                                           'title'  'Lean On Me'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-HHRNBTT-2', 'Q-UNU-1', 'Q-JZFKS-3', "
 "'Q-OLDST-2', 'Q-PLAY-3', 'q-syn-2', 'q-bass-3', 'q-busy-2', 'q-grit-1', "
 "'Q-PIANO-2', 'q-chart-4', 'q-drums-2', 'q-other-1', 'q-vocals-4', "
 "'q-mixbeat-2']")
                                      'lastfmtags'  "['rnb', 'rhythm and blues', 'soul', 'funk', '70s']"
                                     'discogstags'  "['jazz', 'funk / soul', 'soul', 'soul-jazz']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  '10'
                                            'date'  '1980'
                                        'comments'  ''
                                           'genre'  'funk or soul-soul-pop'
                                             'bpm'  '142.708'
                                             'key'  '8B'
                                        'acoustid'  ''
rest: ''

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

'COMM:CDDB Disc ID:XXX'                             '8508810A'
'COMM:ID3v1 Comment:XXX'                            '8508810A'
'TALB' (Album/Movie/Show title)                     "Bill Withers' Greatest Hits"
'TBPM' (BPM (beats per minute))                     '142.708'
'TCON' (Content type, a.k.a. Genre)                 'funk or soul-soul-pop'
'TDRC' (Recording time)                             '1980'
'TIT2' (Title/songname/content description)         'Lean On Me'
'TKEY' (Initial key)                                '8B'
'TPE1' (Lead performer(s)/Soloist(s))               'Bill Withers'
'TRCK' (Track number/Position in set)               '7/10'
'TSSE' (Software/Hardware and settings used for encoding)  'Audiograbber 1.80, LAME dll 3.89, VBR 3, Stereo, High quality'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '2'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['jazz', 'funk / soul', 'soul', 'soul-jazz']
'TXXX:lastfmtags'                                   ['rnb', 'rhythm and blues', 'soul', 'funk', '70s']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '1'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.86 dB'
'TXXX:replaygain_track_peak'                        '0.708494'

========================== row from database ==========================
                                              'id'  1533517
                                            'path'  /data/Music/Bulk/00popandrock-swing-funk-soul/Bill Withers_ Greatest Hits/Bill Withers - 07 - Lean On Me.mp3
                                         'working'  None
                                         'bitrate'  165
                                    'duration_sec'  257
                                           'genre'  funk or soul-soul-pop
                                        'filesize'  5322842
                                           'mtime'  1620526774
                                   'redo_metaread'  0
                                        'rest_str'   00popandrock swing funk soul Withers_ 07 funk or soul soul pop
                                      'tag_artist'  Bill Withers
                                     'tag_release'  Bill Withers' Greatest Hits
                                       'tag_title'  Lean On Me
                                             'bpm'  142.708
                                    'search_title'  'lean':1 'me':3 'on':2
                                   'search_artist'  'bill':1 'withers':2
                                  'search_release'  'bill':1 'greatest':4 'hits':5 'withers':2,3
                                     'search_rest'  'funk':2 'or':5 'pop':6 'soul':3 'swing':1 'withers':4
                                    'search_combo'  'bill':4B,6C 'funk':12 'greatest':9C 'hits':10C 'lean':1A 'me':3A 'on':2A 'or':15 'pop':16 'soul':13 'swing':11 'withers':5B,7C,8C,14
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  8B
                                           'quals'  ['Q-HHRNBTT-2', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-mixbeat-2', 'Q-PIANO-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-2', 'q-syn-2', 'q-chart-4', 'q-other-1', 'Q-HAP-3', 'Q-PLAY-3', 'q-bass-3', 'q-grit-1']
                                      'lastfmtags'  ['rnb', 'rhythm and blues', 'soul', 'funk', '70s']
                                        'tag_date'  1980
                                     'discogstags'  ['jazz', 'funk / soul', 'soul', 'soul-jazz']

============================== file details ==============================
                                           'mtime'  1620526774.1856575  (2021-05-09 04:19:34)
                             'size'  5322842