======================== unified (from filesystem) ========================
                                         'bitrate'  '226.704'
                                        'duration'  '255'
                                          'artist'  'Soggy Bottom Boys Feat. Dan Tyminski'
                                     'text_people'  ''
                                         'release'  'The Very Best Country and Bluegrass'
                                           'title'  'I Am A Man of Constant Sorrow'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-OLDST-1', 'Q-UNU-2', 'q-syn-1', 'q-bass-4', "
 "'q-busy-2', 'q-grit-2', 'q-play-2', 'q-chart-2', 'q-drums-1', 'q-other-3', "
 "'q-piano-1', 'q-vocals-4', 'Q-HHRNBTT-1', 'q-mixbeat-1', 'Q-LOCALNESS-3']")
                                      'lastfmtags'  "['bluegrass', 'country', 'folk', 'soundtrack', 'americana']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '3'
                                      'tracktotal'  ''
                                            'date'  '2013'
                                        'comments'  ''
                                           'genre'  'loc-namerica-country'
                                             'bpm'  '84.455'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Very Best Country and Bluegrass'
'TBPM' (BPM (beats per minute))                     '84.455'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country'
'TDRC' (Recording time)                             '2013'
'TENC' (Encoded by)                                 'GTi'
'TIT2' (Title/songname/content description)         'I Am A Man of Constant Sorrow'
'TKEY' (Initial key)                                '7B'
'TLAN' (Language(s))                                'English'
'TPE1' (Lead performer(s)/Soloist(s))               'Soggy Bottom Boys Feat. Dan Tyminski'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '3'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '2'
'TXXX:lastfmtags'                                   ['bluegrass', 'country', 'folk', 'soundtrack', 'americana']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'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'                                     '4'
'TXXX:replaygain_track_gain'                        '-0.11 dB'
'TXXX:replaygain_track_peak'                        '0.418909'

========================== row from database ==========================
                                              'id'  978365
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/VA-The_Very_Best_Country_And_Bluegrass-2CD-2013-GTi/103-soggy_bottom_boys_feat._dan_tyminski-i_am_a_man_of_constant_sorrow-gti.mp3
                                         'working'  None
                                         'bitrate'  226
                                    'duration_sec'  255
                                           'genre'  loc-namerica-country
                                        'filesize'  7237126
                                           'mtime'  1621628414
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country VA The_Very_Best_Country_And_Bluegrass 2CD 2013 GTi 103 soggy_bottom_boys_feat._dan_tyminski i_am_a_man_of_constant_sorrow gti loc namerica country
                                      'tag_artist'  Soggy Bottom Boys Feat. Dan Tyminski
                                     'tag_release'  The Very Best Country and Bluegrass
                                       'tag_title'  I Am A Man of Constant Sorrow
                                             'bpm'  84.455
                                    'search_title'  'a':3 'am':2 'constant':6 'i':1 'man':4 'of':5 'sorrow':7
                                   'search_artist'  'bottom':2 'boys':3 'dan':6 'feat':4,5 'soggy':1 'tyminski':7
                                  'search_release'  'and':5 'best':3 'bluegrass':6 'country':4 'the':1 'very':2
                                     'search_rest'  '103':15 '2013':13 '2cd':12 'a':30 'am':29 'and':10 'best':8 'bluegrass':11 'bottom':17,23 'boys':18,24 'constant':33 'country':4,9 'dan':20,26 'exotica':2 'feat':19,25 'gti':14 'i':28 'jazz':1 'loc':35 'man':31 'namerica':36 'of':32 'oldies':3 'soggy':16,22 'sorrow':34 'the':6 'tyminski':21,27 'va':5 'very':7
                                    'search_combo'  '103':35 '2013':33 '2cd':32 'a':3A,50 'am':2A,49 'and':19C,30 'best':17C,28 'bluegrass':20C,31 'bottom':9B,37,43 'boys':10B,38,44 'constant':6A,53 'country':18C,24,29 'dan':13B,40,46 'exotica':22 'feat':11B,12B,39,45 'gti':34 'i':1A,48 'jazz':21 'loc':55 'man':4A,51 'namerica':56 'of':5A,52 'oldies':23 'soggy':8B,36,42 'sorrow':7A,54 'the':15C,26 'tyminski':14B,41,47 'va':25 'very':16C,27
                                    'tag_tracknum'  3
                                      'num_images'  0
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-2', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['bluegrass', 'country', 'folk', 'soundtrack', 'americana']
                                        'tag_date'  2013
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621628413.6298537  (2021-05-21 22:20:13)
                             'size'  7237126