======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '158'
                                          'artist'  "Sousa's Band"
                                     'text_people'  ''
                                         'release'  '[non-album tracks]'
                                           'title'  'Patriot Polka (trombone - Arthur Pryor)'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-2', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-1', 'q-play-2', "
 "'q-chart-1', 'q-drums-1', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['1900s', 'all', 'big band', '1890s', '1901']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1902'
                                        'comments'  ''
                                           'genre'  'prerock-band'
                                             'bpm'  '145.685'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     '[non-album tracks]'
'TBPM' (BPM (beats per minute))                     '145.685'
'TCON' (Content type, a.k.a. Genre)                 'prerock-band'
'TDRC' (Recording time)                             '1902'
'TIT2' (Title/songname/content description)         'Patriot Polka (trombone - Arthur Pryor)'
'TKEY' (Initial key)                                '7B'
'TPE1' (Lead performer(s)/Soloist(s))               "Sousa's Band"
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '2'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['1900s', 'all', 'big band', '1890s', '1901']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '1'
'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'                        '+1.09 dB'
'TXXX:replaygain_track_peak'                        '0.550798'

========================== row from database ==========================
                                              'id'  1498055
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1902/Sousa_s Band - Patriot Polka (trombone - Arthur Pryor) 1902.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  158
                                           'genre'  prerock-band
                                        'filesize'  3163826
                                           'mtime'  1620558442
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1902 Sousa_s 1902 prerock band
                                      'tag_artist'  Sousa's Band
                                     'tag_release'  [non-album tracks]
                                       'tag_title'  Patriot Polka (trombone - Arthur Pryor)
                                             'bpm'  145.685
                                    'search_title'  'arthur':5 'patriot':1 'polka':2 'pryor':6,7 'trombone':3,4
                                   'search_artist'  'band':4 's':2 'sousa':1 'sousas':3
                                  'search_release'  'album':2 'non':1 'nonalbum':3 'tracks':4,5
                                     'search_rest'  '00oldiepop':5 '1902':6 'band':10 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':9 's':8 'sousa':7
                                    'search_combo'  '00oldiepop':21 '1902':22 'album':13C 'arthur':5A 'band':11B,26 'country':20 'exotica':18 'jazz':17 'non':12C 'nonalbum':14C 'oldies':19 'patriot':1A 'polka':2A 'prerock':25 'pryor':6A,7A 's':9B,24 'sousa':8B,23 'sousas':10B 'tracks':15C,16C 'trombone':3A,4A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-1', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-2', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  ['1900s', 'all', 'big band', '1890s', '1901']
                                        'tag_date'  1902
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620558441.728557  (2021-05-09 13:07:21)
                             'size'  3163826