======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '129'
                                          'artist'  'Johnny Cash'
                                     'text_people'  ''
                                         'release'  'The Very Best Of'
                                           'title'  "I Won't Back Down"
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-OLDST-3', 'Q-HHRNBTT-1', "
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 "'q-chart-4', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
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                                      'lastfmtags'  "['country', 'singer songwritergdchill', 'cover', 'singer songwriter']"
                                     'discogstags'  "['rock', 'blues', 'folk, world, & country']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '18'
                                      'tracktotal'  ''
                                            'date'  '2001'
                                        'comments'  ''
                                           'genre'  'loc-namerica-country'
                                             'bpm'  '115.4'
                                             'key'  '11B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Very Best Of'
'TBPM' (BPM (beats per minute))                     '115.4'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country'
'TDRC' (Recording time)                             '2001'
'TIT2' (Title/songname/content description)         "I Won't Back Down"
'TKEY' (Initial key)                                '11B'
'TPE1' (Lead performer(s)/Soloist(s))               'Johnny Cash'
'TRCK' (Track number/Position in set)               '18'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['rock', 'blues', 'folk, world, & country']
'TXXX:lastfmtags'                                   ['country', 'singer songwritergdchill', 'cover', 'singer songwriter']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+0.91 dB'
'TXXX:replaygain_track_peak'                        '0.391869'

========================== row from database ==========================
                                              'id'  1499775
                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/Johnny Cash_/Man In Black (The Very Best Of)/Cd 2/18 - I Won_t Back Down.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  129
                                           'genre'  loc-namerica-country
                                        'filesize'  3111530
                                           'mtime'  1621630287
                                   'redo_metaread'  0
                                        'rest_str'   00singer songwriter eos Cash_ Man In Black (The Of) Cd 2 18 Won_t loc namerica country
                                      'tag_artist'  Johnny Cash
                                     'tag_release'  The Very Best Of
                                       'tag_title'  I Won't Back Down
                                             'bpm'  115.4
                                    'search_title'  'back':5 'down':6 'i':1 't':3 'won':2 'wont':4
                                   'search_artist'  'cash':2 'johnny':1
                                  'search_release'  'best':3 'of':4 'the':1 'very':2
                                     'search_rest'  '00singer':1 '18':14 '2':13 'black':7 'cash':4 'cd':12 'country':19 'eos':3 'in':6 'loc':17 'man':5 'namerica':18 'of':10,11 'songwriter':2 't':16 'the':8,9 'won':15
                                    'search_combo'  '00singer':13 '18':26 '2':25 'back':5A 'best':11C 'black':19 'cash':8B,16 'cd':24 'country':31 'down':6A 'eos':15 'i':1A 'in':18 'johnny':7B 'loc':29 'man':17 'namerica':30 'of':12C,22,23 'songwriter':14 't':3A,28 'the':9C,20,21 'very':10C 'won':2A,27 'wont':4A
                                    'tag_tracknum'  18
                                      'num_images'  0
                                             'key'  11B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-4', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['country', 'singer songwritergdchill', 'cover', 'singer songwriter']
                                        'tag_date'  2001
                                     'discogstags'  ['rock', 'blues', 'folk, world, & country']

============================== file details ==============================
                                           'mtime'  1621630286.6318843  (2021-05-21 22:51:26)
                             'size'  3111530