======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '179'
                                          'artist'  'Ruby Glaze And Blind Willie Mctell'
                                     'text_people'  ''
                                         'release'  'Sissy Man Blues (1927-1936)'
                                           'title'  "Rollin' Mama Blues"
                                           'quals'  ("['Q-HAP-2', 'Q-LOCALNESS-2', 'Q-JZFKS-3', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-2', 'q-syn-1', 'q-bass-2', 'q-busy-2', 'q-grit-2', 'q-play-3', "
 "'q-chart-1', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '20'
                                      'tracktotal'  ''
                                            'date'  '1930'
                                        'comments'  ''
                                           'genre'  'prerock-jb-blues'
                                             'bpm'  '89.060'
                                             'key'  '8B'
                                        'acoustid'  ''
rest: ''

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

'APIC:'                                             type PictureType.COVER_FRONT (Cover (front)) b''
                                     
'TALB' (Album/Movie/Show title)                     'Sissy Man Blues (1927-1936)'
'TBPM' (BPM (beats per minute))                     '89.060'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-blues'
'TDRC' (Recording time)                             '1930'
'TIT2' (Title/songname/content description)         "Rollin' Mama Blues"
'TKEY' (Initial key)                                '8B'
'TPE1' (Lead performer(s)/Soloist(s))               'Ruby Glaze And Blind Willie Mctell'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TRCK' (Track number/Position in set)               '20'
'TSSE' (Software/Hardware and settings used for encoding)  'Lame3.92'
'TXXX:Q-HAP'                                        '2'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:q-bass'                                       '2'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '2'
'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'                        '+2.14 dB'
'TXXX:replaygain_track_peak'                        '0.760645'

========================== row from database ==========================
                                              'id'  1506986
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/v.a. - sissy man blues ( 1927-1936 )/23 - Ruby Glaze And Blind Willie Mctell - Rollin_ Mama Blues.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  179
                                           'genre'  prerock-jb-blues
                                        'filesize'  4408388
                                           'mtime'  1620402845
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country v.a. sissy man blues 23 Rollin_ prerock jb blues
                                      'tag_artist'  Ruby Glaze And Blind Willie Mctell
                                     'tag_release'  Sissy Man Blues (1927-1936)
                                       'tag_title'  Rollin' Mama Blues
                                             'bpm'  89.06
                                    'search_title'  'blues':4 'mama':3 'rollin':1,2
                                   'search_artist'  'and':3 'blind':4 'glaze':2 'mctell':6 'ruby':1 'willie':5
                                  'search_release'  '1927':4 '19271936':6 '1936':5 'blues':3 'man':2 'sissy':1
                                     'search_rest'  '23':11 'a':6 'blues':10 'country':4 'exotica':2 'jazz':1 'jb':14 'man':9 'oldies':3 'prerock':13 'rollin':12 'sissy':8 'v':5 'va':7
                                    'search_combo'  '1927':14C '19271936':16C '1936':15C '23':27 'a':22 'and':7B 'blind':8B 'blues':4A,13C,26 'country':20 'exotica':18 'glaze':6B 'jazz':17 'jb':30 'mama':3A 'man':12C,25 'mctell':10B 'oldies':19 'prerock':29 'rollin':1A,2A,28 'ruby':5B 'sissy':11C,24 'v':21 'va':23 'willie':9B
                                    'tag_tracknum'  20
                                      'num_images'  1
                                             'key'  8B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-2', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-2', 'q-drums-2', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-2', 'q-bass-2', 'q-grit-2']
                                      'lastfmtags'  []
                                        'tag_date'  1930
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620402845.047673  (2021-05-07 17:54:05)
                             'size'  4408388