======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '129'
                                          'artist'  "Sousa's Band"
                                     'text_people'  ''
                                         'release'  '[non-album tracks]'
                                           'title'  'My Maryland March (Mygrant)'
                                           '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-3', 'q-other-4', 'q-piano-1', 'q-vocals-1', "
 "'q-mixbeat-1']")
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1912'
                                        'comments'  ''
                                           'genre'  'prerock-band'
                                             'bpm'  '123.256'
                                             'key'  '7B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     '[non-album tracks]'
'TBPM' (BPM (beats per minute))                     '123.256'
'TCON' (Content type, a.k.a. Genre)                 'prerock-band'
'TDRC' (Recording time)                             '1912'
'TIT2' (Title/songname/content description)         'My Maryland March (Mygrant)'
'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:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '1'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '1'
'TXXX:replaygain_track_gain'                        '+0.75 dB'
'TXXX:replaygain_track_peak'                        '0.666050'

========================== row from database ==========================
                                              'id'  1511541
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1912/Sousa_s Band - My Maryland March 1912.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  129
                                           'genre'  prerock-band
                                        'filesize'  2594610
                                           'mtime'  1620559310
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1912 Sousa_s 1912 prerock band
                                      'tag_artist'  Sousa's Band
                                     'tag_release'  [non-album tracks]
                                       'tag_title'  My Maryland March (Mygrant)
                                             'bpm'  123.256
                                    'search_title'  'march':3 'maryland':2 'my':1 'mygrant':4,5
                                   '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 '1912':6 'band':10 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':9 's':8 'sousa':7
                                    'search_combo'  '00oldiepop':19 '1912':20 'album':11C 'band':9B,24 'country':18 'exotica':16 'jazz':15 'march':3A 'maryland':2A 'my':1A 'mygrant':4A,5A 'non':10C 'nonalbum':12C 'oldies':17 'prerock':23 's':7B,22 'sousa':6B,21 'sousas':8B 'tracks':13C,14C
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  7B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-1', '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-3', 'q-syn-1', 'q-chart-1', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-1']
                                      'lastfmtags'  []
                                        'tag_date'  1912
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620559309.676707  (2021-05-09 13:21:49)
                             'size'  2594610