======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '111'
                                          'artist'  'Johnny Cash & The Tennessee Two'
                                     'text_people'  'Jack Clement'
                                         'release'  ''
                                           'title'  'Guess Things Happen That Way'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-LOCALNESS-3', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'Q-PLAY-2', 'q-syn-1', 'q-bass-1', 'q-busy-2', 'q-grit-1', "
 "'q-chart-1', 'q-drums-1', 'q-other-2', 'q-vocals-4', 'q-mixbeat-1', "
 "'Q-PIANO-2']")
                                      'lastfmtags'  "['country', 'johnny cash', 'usa', 'folk', 'rockabilly']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '7'
                                      'tracktotal'  ''
                                            'date'  '1958'
                                        'comments'  ''
                                           'genre'  'prerock-country'
                                             'bpm'  '145.790'
                                             'key'  '6B'
                                        'acoustid'  ''
rest: ''

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

'COMM::eng'                                         '58-104 POS 11'
'COMM:ID3v1 Comment:XXX'                            '58-104 POS 11'
'MCDI' (Music CD identifier)                        MCDI(data=b'F\x00+\x009\x006\x00+\x003\x005\x002\x005\x00+\x005\x00F\x00A\x005\x00+\x008\x00A\x00D\x006\x00+\x00A\x00D\x00B\x003\x00+\x00D\x007\x002\x00F\x00+\x001\x000\x001\x003\x007\x00+\x001\x002\x001\x00C\x001\x00+\x001\x005\x001\x005\x00F\x00+\x001\x007\x009\x005\x003\x00+\x001\x00A\x00A\x007\x00B\x00+\x001\x00D\x00A\x00C\x009\x00+\x002\x000\x00D\x00A\x00A\x00+\x002\x003\x00E\x002\x001\x00+\x002\x006\x00C\x005\x00C\x00+\x002\x009\x009\x00A\x00A\x00\x00\x00')
'PRIV:AverageLevel:ð\n\x00\x00'                     PRIV(owner='AverageLevel', data=b'\xf0\n\x00\x00')
'PRIV:PeakValue:¶f\x00\x00'                         PRIV(owner='PeakValue', data=b'\xb6f\x00\x00')
'PRIV:WM/MediaClassPrimaryID:¼}`Ñ#ãâK\x86¡H¤*(D\x1e'  PRIV(owner='WM/MediaClassPrimaryID', data=b'\xbc}`\xd1#\xe3\xe2K\x86\xa1H\xa4*(D\x1e')
'PRIV:WM/MediaClassSecondaryID:\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'  PRIV(owner='WM/MediaClassSecondaryID', data=b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
'PRIV:WM/Provider:A\x00M\x00G\x00\x00\x00'          PRIV(owner='WM/Provider', data=b'A\x00M\x00G\x00\x00\x00')
'PRIV:WM/UniqueFileIdentifier:A\x00M\x00G\x00a\x00_\x00i\x00d\x00=\x00R\x00 \x00 \x00 \x006\x003\x004\x007\x005\x001\x00;\x00A\x00M\x00G\x00p\x00_\x00i\x00d\x00=\x00V\x00A\x00;\x00A\x00M\x00G\x00t\x00_\x00i\x00d\x00=\x00T\x00 \x00 \x006\x001\x002\x002\x003\x004\x004\x00\x00\x00'  PRIV(owner='WM/UniqueFileIdentifier', data=b'A\x00M\x00G\x00a\x00_\x00i\x00d\x00=\x00R\x00 \x00 \x00 \x006\x003\x004\x007\x005\x001\x00;\x00A\x00M\x00G\x00p\x00_\x00i\x00d\x00=\x00V\x00A\x00;\x00A\x00M\x00G\x00t\x00_\x00i\x00d\x00=\x00T\x00 \x00 \x006\x001\x002\x002\x003\x004\x004\x00\x00\x00')
'PRIV:WM/WMCollectionGroupID:¶c\x9b\x99A\x1f·L¬\x8bǬæ\x82\x1eL'  PRIV(owner='WM/WMCollectionGroupID', data=b'\xb6c\x9b\x99A\x1f\xb7L\xac\x8b\xc7\xac\xe6\x82\x1eL')
'PRIV:WM/WMCollectionID:!Cx§\x02omO·\x81VmÓÍ\r6'    PRIV(owner='WM/WMCollectionID', data=b'!Cx\xa7\x02omO\xb7\x81Vm\xd3\xcd\r6')
'PRIV:WM/WMContentID:²Ðhâ\x1c>0N¸\x15åX\x00ú!í'     PRIV(owner='WM/WMContentID', data=b'\xb2\xd0h\xe2\x1c>0N\xb8\x15\xe5X\x00\xfa!\xed')
'TBPM' (BPM (beats per minute))                     '145.790'
'TCOM' (Composer)                                   'Jack Clement'
'TCON' (Content type, a.k.a. Genre)                 'prerock-country'
'TDRC' (Recording time)                             '1958'
'TIT2' (Title/songname/content description)         'Guess Things Happen That Way'
'TKEY' (Initial key)                                '6B'
'TLEN' (Length)                                     '111066'
'TPE1' (Lead performer(s)/Soloist(s))               'Johnny Cash & The Tennessee Two'
'TPE2' (Band/orchestra/accompaniment)               'Various Artists'
'TPUB' (Publisher)                                  'Time Life'
'TRCK' (Track number/Position in set)               '7'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-PIANO'                                      '2'
'TXXX:Q-PLAY'                                       '2'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['country', 'johnny cash', 'usa', 'folk', 'rockabilly']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.44 dB'
'TXXX:replaygain_track_peak'                        '0.675451'

========================== row from database ==========================
                                              'id'  1451925
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1958/58-104 - Johnny Cash & The Tennessee Two - Guess Things Happen That Way.mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  111
                                           'genre'  prerock-country
                                        'filesize'  4444578
                                           'mtime'  1621627905
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1958 58 104 prerock country
                                      'tag_artist'  Johnny Cash & The Tennessee Two
                                     'tag_release'  None
                                       'tag_title'  Guess Things Happen That Way
                                             'bpm'  145.79
                                    'search_title'  'guess':1 'happen':3 'that':4 'things':2 'way':5
                                   'search_artist'  'cash':2 'johnny':1 'tennessee':4 'the':3 'two':5
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '104':8 '1958':6 '58':7 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':9
                                    'search_combo'  '00oldiepop':15 '104':18 '1958':16 '58':17 'cash':7B 'country':14 'exotica':12 'guess':1A 'happen':3A 'jazz':11 'johnny':6B 'oldies':13 'prerock':19 'tennessee':9B 'that':4A 'the':8B 'things':2A 'two':10B 'way':5A
                                    'tag_tracknum'  7
                                      'num_images'  0
                                             'key'  6B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-mixbeat-1', 'Q-PIANO-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-2', 'Q-HAP-3', 'Q-PLAY-2', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['country', 'johnny cash', 'usa', 'folk', 'rockabilly']
                                        'tag_date'  1958
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621627904.9233599  (2021-05-21 22:11:44)
                             'size'  4444578