======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '177'
                                          'artist'  'The Carter Family'
                                     'text_people'  'Traditional'
                                         'release'  'Anthology Of American Fold Music'
                                           'title'  'John Hardy Was A Desperate Little Man'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-2', 'Q-HHRNBTT-1', 'Q-LOCALNESS-3', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-2', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['30s', 'americana', 'country', 'bluegrass', 'folk', 'old timey']"
                                     'discogstags'  "['folk, world, & country']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '17'
                                      'tracktotal'  '84'
                                            'date'  '1928'
                                        'comments'  ''
                                           'genre'  'loc-namerica;prerock-americana'
                                             'bpm'  '115.987'
                                             'key'  '1B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'COMM:ID3v1 Comment:XXX'                            '00000a05 00000005 000091f1 0'
'COMM:iTunNORM:eng'                                 ('00000a05 00000005 000091f1 00001331 0001cf43 0001c5c6 000068e2 000068e2 '
 '0000234e 0000234e')
'COMM:iTunSMPB:eng'                                 ('00000000 00000210 000009b4 000000000077a03c 00000000 00000000 00000000 '
 '00000000 00000000 00000000 00000000 00000000')
'COMM:iTunes_CDDB_IDs:eng'                          '13+6174da05eae4d23c851d47bd328c8b0a+799438'
'TALB' (Album/Movie/Show title)                     'Anthology Of American Fold Music'
'TBPM' (BPM (beats per minute))                     '115.987'
'TCOM' (Composer)                                   'Traditional'
'TCON' (Content type, a.k.a. Genre)                 ['loc-namerica', 'prerock-americana']
'TDRC' (Recording time)                             '1928'
'TENC' (Encoded by)                                 'Itunes V6.0.1.3'
'TIT2' (Title/songname/content description)         'John Hardy Was A Desperate Little Man'
'TKEY' (Initial key)                                '1B'
'TPE1' (Lead performer(s)/Soloist(s))               'The Carter Family'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPOS' (Part of a set)                              '2/6'
'TRCK' (Track number/Position in set)               '17/84'
'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:discogstags'                                  'folk, world, & country'
'TXXX:lastfmtags'                                   ['30s', 'americana', 'country', 'bluegrass', 'folk', 'old timey']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'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'                        '+1.99 dB'
'TXXX:replaygain_track_peak'                        '0.485749'

========================== row from database ==========================
                                              'id'  984882
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Various Artists - 1952 - Anthology Of American Fold Music/17 - John Hardy Was A Desperate Little Man - The Carter Family.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  177
                                           'genre'  loc-namerica;prerock-americana
                                        'filesize'  3574727
                                           'mtime'  1621628427
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country Various Artists 1952 17 loc namerica;prerock americana
                                      'tag_artist'  The Carter Family
                                     'tag_release'  Anthology Of American Fold Music
                                       'tag_title'  John Hardy Was A Desperate Little Man
                                             'bpm'  115.987
                                    'search_title'  'a':4 'desperate':5 'hardy':2 'john':1 'little':6 'man':7 'was':3
                                   'search_artist'  'carter':2 'family':3 'the':1
                                  'search_release'  'american':3 'anthology':1 'fold':4 'music':5 'of':2
                                     'search_rest'  '1952':7 'americana':13 'artists':6 'country':4 'exotica':2 'jazz':1 'loc':8 'namerica':9,11 'oldies':3 'prerock':10,12 'various':5
                                    'search_combo'  '1952':22 'a':4A 'american':13C 'americana':28 'anthology':11C 'artists':21 'carter':9B 'country':19 'desperate':5A 'exotica':17 'family':10B 'fold':14C 'hardy':2A 'jazz':16 'john':1A 'little':6A 'loc':23 'man':7A 'music':15C 'namerica':24,26 'of':12C 'oldies':18 'prerock':25,27 'the':8B 'various':20 'was':3A
                                    'tag_tracknum'  17
                                      'num_images'  1
                                             'key'  1B
                                           '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-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['30s', 'americana', 'country', 'bluegrass', 'folk', 'old timey']
                                        'tag_date'  1928
                                     'discogstags'  ['folk, world, & country']

============================== file details ==============================
                                           'mtime'  1621628426.819005  (2021-05-21 22:20:26)
                             'size'  3574727