======================== unified (from filesystem) ========================
                                         'bitrate'  '213.252'
                                        'duration'  '148'
                                          'artist'  'Roy Rogers'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  ' Hadie brown (1937)'
                                           '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-2', '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'  "['blues rock', 'country', 'blues', 'western', 'cowboy songs']"
                                     'discogstags'  "['house', 'electronic', 'disco']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1945'
                                        'comments'  ''
                                           'genre'  'loc-namerica-country'
                                             'bpm'  '140.141'
                                             'key'  '1A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '140.141'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country'
'TDRC' (Recording time)                             '1945'
'TIT2' (Title/songname/content description)         ' Hadie brown (1937)'
'TKEY' (Initial key)                                '1A'
'TPE1' (Lead performer(s)/Soloist(s))               'Roy Rogers'
'TPOS' (Part of a set)                              '1/1'
'TSSE' (Software/Hardware and settings used for encoding)  'Lavf56.40.101'
'TXXX:DeviceConformanceTemplate'                    'L1'
'TXXX:IsVBR'                                        '1'
'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'                                  ['house', 'electronic', 'disco']
'TXXX:lastfmtags'                                   ['blues rock', 'country', 'blues', 'western', 'cowboy songs']
'TXXX:q-bass'                                       '1'
'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'                        '+2.83 dB'
'TXXX:replaygain_track_peak'                        '0.372382'

========================== row from database ==========================
                                              'id'  967217
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Old Country Music/Roy Rogers - Hadie brown (1937).wma.mp3
                                         'working'  None
                                         'bitrate'  213
                                    'duration_sec'  148
                                           'genre'  loc-namerica-country
                                        'filesize'  3948628
                                           'mtime'  1621628277
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country Old Country Music (1937).wma loc namerica country
                                      'tag_artist'  Roy Rogers
                                     'tag_release'  None
                                       'tag_title'   Hadie brown (1937)
                                             'bpm'  140.141
                                    'search_title'  '1937':3,4 'brown':2 'hadie':1
                                   'search_artist'  'rogers':2 'roy':1
                                  'search_release'  
                                     'search_rest'  '1937':7 '1937wma':9 'country':4 'exotica':2 'jazz':1 'loc':10 'music':6 'namerica':11 'old':5 'oldies':3 'wma':8
                                    'search_combo'  '1937':3A,4A,13 '1937wma':15 'brown':2A 'country':10 'exotica':8 'hadie':1A 'jazz':7 'loc':16 'music':12 'namerica':17 'old':11 'oldies':9 'rogers':6B 'roy':5B 'wma':14
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  1A
                                           '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-1', 'q-grit-2']
                                      'lastfmtags'  ['blues rock', 'country', 'blues', 'western', 'cowboy songs']
                                        'tag_date'  1945
                                     'discogstags'  ['house', 'electronic', 'disco']

============================== file details ==============================
                                           'mtime'  1621628277.464286  (2021-05-21 22:17:57)
                             'size'  3948628