======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '144'
                                          'artist'  'Bob Thompson'
                                     'text_people'  ''
                                         'release'  'MMM Nice!'
                                           'title'  'The Best Thing for You'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-2', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-2', 'q-syn-1', 'q-bass-4', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-2', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['lounge', 'instrumental', 'swing', 'spoken word', 'easy listening']"
                                     'discogstags'  "['jazz', 'easy listening']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1959'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-lounge or exotica or bossa'
                                             'bpm'  '90.3'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'MMM Nice!'
'TBPM' (BPM (beats per minute))                     '90.3'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-lounge or exotica or bossa'
'TDRC' (Recording time)                             '1959'
'TENC' (Encoded by)                                 'SoundJam MP'
'TIT2' (Title/songname/content description)         'The Best Thing for You'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Bob Thompson'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['jazz', 'easy listening']
'TXXX:lastfmtags'                                   ['lounge', 'instrumental', 'swing', 'spoken word', 'easy listening']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.58 dB'
'TXXX:replaygain_track_peak'                        '0.627884'

========================== row from database ==========================
                                              'id'  746235
                                            'path'  /data/Music/Bulk/00exnnpjpsprgttidm/va - space age pop & mid century domestics (jingles & themes)/(1959) bob thompson - the best thing for you.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  144
                                           'genre'  prerock-jb-jazz-lounge or exotica or bossa
                                        'filesize'  5795060
                                           'mtime'  1620539300
                                   'redo_metaread'  0
                                        'rest_str'   00exnnpjpsprgttidm va space age pop & mid century domestics (jingles & themes) (1959) bob thompson the best thing you prerock jb jazz lounge exotica bossa
                                      'tag_artist'  Bob Thompson
                                     'tag_release'  MMM Nice!
                                       'tag_title'  The Best Thing for You
                                             'bpm'  90.3
                                    'search_title'  'best':2 'for':4 'the':1 'thing':3 'you':5
                                   'search_artist'  'bob':1 'thompson':2
                                  'search_release'  'mmm':1 'nice':2
                                     'search_rest'  '1959':12,13 'age':3 'best':17 'bob':14 'bossa':25 'century':6 'domestics':7 'exotica':24 'jazz':22 'jb':21 'jingles':8,9 'lounge':23 'mid':5 'pop':4 'prerock':20 'space':2 'the':16 'themes':10,11 'thing':18 'thompson':15 'va':1 'you':19
                                    'search_combo'  '1959':21,22 'age':12 'best':2A,26 'bob':6B,23 'bossa':34 'century':15 'domestics':16 'exotica':33 'for':4A 'jazz':31 'jb':30 'jingles':17,18 'lounge':32 'mid':14 'mmm':8C 'nice':9C 'pop':13 'prerock':29 'space':11 'the':1A,25 'themes':19,20 'thing':3A,27 'thompson':7B,24 'va':10 'you':5A,28
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-3', 'q-drums-2', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['lounge', 'instrumental', 'swing', 'spoken word', 'easy listening']
                                        'tag_date'  1959
                                     'discogstags'  ['jazz', 'easy listening']

============================== file details ==============================
                                           'mtime'  1620539300.366674  (2021-05-09 07:48:20)
                             'size'  5795060