======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '198'
                                          'artist'  'Neil Sedaka'
                                     'text_people'  ''
                                         'release'  'Billboard Top Pop Singles of 1'
                                           'title'  'Breaking Up Is Hard To Do'
                                           'quals'  ("['Q-JZFKS-1', 'Q-HHRNBTT-1', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-OLDST-2', "
 "'Q-PLAY-2', 'q-syn-2', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-chart-3', "
 "'q-drums-2', 'q-other-2', 'q-vocals-4', 'q-mixbeat-2', 'Q-PIANO-2']")
                                      'lastfmtags'  "['oldies', '60s', 'jazz', 'pop', '50s']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '90'
                                      'tracktotal'  ''
                                            'date'  '1976'
                                        'comments'  ''
                                           'genre'  'electronic-generic or radio-unsorted'
                                             'bpm'  '138.417'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'COMM:ID3v1 Comment:XXX'                            'Billboard'
'TALB' (Album/Movie/Show title)                     'Billboard Top Pop Singles of 1'
'TBPM' (BPM (beats per minute))                     '138.417'
'TCON' (Content type, a.k.a. Genre)                 'electronic-generic or radio-unsorted'
'TDRC' (Recording time)                             '1976'
'TIT2' (Title/songname/content description)         'Breaking Up Is Hard To Do'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Neil Sedaka'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '90'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['oldies', '60s', 'jazz', 'pop', '50s']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '3'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '2'
'TXXX:q-other'                                      '2'
'TXXX:q-syn'                                        '2'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+2.16 dB'
'TXXX:replaygain_track_peak'                        '0.845157'

========================== row from database ==========================
                                              'id'  1307739
                                            'path'  /data/Music/Bulk/00poprockelectronic/Billboard/Billboard Top100/1976/091 - Neil Sedaka - Breaking Up Is Hard To Do.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  198
                                           'genre'  electronic-generic or radio-unsorted
                                        'filesize'  4758643
                                           'mtime'  1620567822
                                   'redo_metaread'  0
                                        'rest_str'   00poprockelectronic Top100 1976 091 electronic generic or radio unsorted
                                      'tag_artist'  Neil Sedaka
                                     'tag_release'  Billboard Top Pop Singles of 1
                                       'tag_title'  Breaking Up Is Hard To Do
                                             'bpm'  138.417
                                    'search_title'  'breaking':1 'do':6 'hard':4 'is':3 'to':5 'up':2
                                   'search_artist'  'neil':1 'sedaka':2
                                  'search_release'  '1':6 'billboard':1 'of':5 'pop':3 'singles':4 'top':2
                                     'search_rest'  '00poprockelectronic':1 '1976':3 'electronic':4 'generic':5 'or':6 'radio':7 'top100':2 'unsorted':8
                                    'search_combo'  '00poprockelectronic':15 '1':14C '1976':17 'billboard':9C 'breaking':1A 'do':6A 'electronic':18 'generic':19 'hard':4A 'is':3A 'neil':7B 'of':13C 'or':20 'pop':11C 'radio':21 'sedaka':8B 'singles':12C 'to':5A 'top':10C 'top100':16 'unsorted':22 'up':2A
                                    'tag_tracknum'  90
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-mixbeat-2', 'Q-PIANO-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-2', 'q-chart-3', 'q-other-2', 'Q-PLAY-2', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['oldies', '60s', 'jazz', 'pop', '50s']
                                        'tag_date'  1976
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620567822.219094  (2021-05-09 15:43:42)
                             'size'  4758643