======================== unified (from filesystem) ========================
                                         'bitrate'  '320.0'
                                        'duration'  '180'
                                          'artist'  'Glenn Miller And His Orchestra'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Spring Will Be So Sad (When She Comes This Year)'
                                           'quals'  ("['Q-HAP-3', 'Q-LOCALNESS-1', 'Q-UNU-1', 'Q-JZFKS-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'  "['jazz', 'swing', 'big band', '40s', 'oldies']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '090b'
                                      'tracktotal'  ''
                                            'date'  '1941'
                                        'comments'  ''
                                           'genre'  'prerock-band'
                                             'bpm'  '144.955'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

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

'TBPM' (BPM (beats per minute))                     '144.955'
'TCON' (Content type, a.k.a. Genre)                 'prerock-band'
'TDRC' (Recording time)                             '1941'
'TIT2' (Title/songname/content description)         'Spring Will Be So Sad (When She Comes This Year)'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Glenn Miller And His Orchestra'
'TRCK' (Track number/Position in set)               '090b'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '1'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['jazz', 'swing', 'big band', '40s', 'oldies']
'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'                        '+1.73 dB'
'TXXX:replaygain_track_peak'                        '0.498810'

========================== row from database ==========================
                                              'id'  1432184
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1941/1941-090b - Glenn Miller And His Orchestra - Spring Will Be So Sad (When She Comes This Year).mp3
                                         'working'  None
                                         'bitrate'  320
                                    'duration_sec'  180
                                           'genre'  prerock-band
                                        'filesize'  7222489
                                           'mtime'  1620560887
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1941 1941 090b prerock band
                                      'tag_artist'  Glenn Miller And His Orchestra
                                     'tag_release'  None
                                       'tag_title'  Spring Will Be So Sad (When She Comes This Year)
                                             'bpm'  144.955
                                    'search_title'  'be':3 'comes':9 'sad':5 'she':8 'so':4 'spring':1 'this':10 'when':6,7 'will':2 'year':11,12
                                   'search_artist'  'and':3 'glenn':1 'his':4 'miller':2 'orchestra':5
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '090b':7 '1941':6 'band':9 'country':4 'exotica':2 'jazz':1 'oldies':3 'prerock':8
                                    'search_combo'  '00oldiepop':22 '090b':24 '1941':23 'and':15B 'band':26 'be':3A 'comes':9A 'country':21 'exotica':19 'glenn':13B 'his':16B 'jazz':18 'miller':14B 'oldies':20 'orchestra':17B 'prerock':25 'sad':5A 'she':8A 'so':4A 'spring':1A 'this':10A 'when':6A,7A 'will':2A 'year':11A,12A
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           '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-1', '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'  ['jazz', 'swing', 'big band', '40s', 'oldies']
                                        'tag_date'  1941
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1620560886.7721941  (2021-05-09 13:48:06)
                             'size'  7222489