======================== unified (from filesystem) ========================
                                         'bitrate'  '256.0'
                                        'duration'  '60'
                                          'artist'  'Sun Ra'
                                     'text_people'  ''
                                         'release'  'Spaceship Lullaby'
                                           'title'  'Holiday For Strings'
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-3', 'Q-LOCALNESS-2', 'Q-UNU-1', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-1', 'q-busy-3', 'q-grit-2', 'q-play-3', "
 "'q-chart-2', 'q-drums-1', 'q-other-4', 'q-piano-1', 'q-vocals-3', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['free jazz', 'avant garde jazz', 'jazz', 'avant garde', 'experimental']"
                                     'discogstags'  "['jazz', 'rhythm & blues', 'vocal']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '12'
                                      'tracktotal'  '37'
                                            'date'  '2003'
                                        'comments'  ''
                                           'genre'  'prerock-jb-jazz-newer-experimental or free'
                                             'bpm'  '89.3'
                                             'key'  '9A'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'Spaceship Lullaby'
'TBPM' (BPM (beats per minute))                     '89.3'
'TCON' (Content type, a.k.a. Genre)                 'prerock-jb-jazz-newer-experimental or free'
'TDOR' (Original release time)                      '2003'
'TDRC' (Recording time)                             '2003'
'TIT2' (Title/songname/content description)         'Holiday For Strings'
'TKEY' (Initial key)                                '9A'
'TPE1' (Lead performer(s)/Soloist(s))               'Sun Ra'
'TRCK' (Track number/Position in set)               '12/37'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '3'
'TXXX:Q-LOCALNESS'                                  '2'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['jazz', 'rhythm & blues', 'vocal']
'TXXX:lastfmtags'                                   ['free jazz', 'avant garde jazz', 'jazz', 'avant garde', 'experimental']
'TXXX:q-bass'                                       '1'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '2'
'TXXX:q-drums'                                      '1'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '4'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.48 dB'
'TXXX:replaygain_track_peak'                        '0.647211'

========================== row from database ==========================
                                              'id'  1383678
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/Sun Ra - Spaceship Lullaby (1954-60)/12-holiday for strings.mp3
                                         'working'  None
                                         'bitrate'  256
                                    'duration_sec'  60
                                           'genre'  prerock-jb-jazz-newer-experimental or free
                                        'filesize'  1928128
                                           'mtime'  1620535755
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country (1954 60) 12 holiday for strings prerock jb jazz newer experimental free
                                      'tag_artist'  Sun Ra
                                     'tag_release'  Spaceship Lullaby
                                       'tag_title'  Holiday For Strings
                                             'bpm'  89.3
                                    'search_title'  'for':2 'holiday':1 'strings':3
                                   'search_artist'  'ra':2 'sun':1
                                  'search_release'  'lullaby':2 'spaceship':1
                                     'search_rest'  '1954':5,6 '60':7,8 'country':4 'exotica':2 'experimental':15 'for':10 'free':16 'holiday':9 'jazz':1 'jb':13 'newer':14 'oldies':3 'prerock':12 'strings':11
                                    'search_combo'  '1954':12,13 '60':14,15 'country':11 'exotica':9 'experimental':22 'for':2A,17 'free':23 'holiday':1A,16 'jazz':8 'jb':20 'lullaby':7C 'newer':21 'oldies':10 'prerock':19 'ra':5B 'spaceship':6C 'strings':3A,18 'sun':4B
                                    'tag_tracknum'  12
                                      'num_images'  0
                                             'key'  9A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-2', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-3', 'q-busy-3', 'q-drums-1', 'q-syn-1', 'q-chart-2', 'q-other-4', 'Q-HAP-3', 'q-bass-1', 'q-grit-2']
                                      'lastfmtags'  ['free jazz', 'avant garde jazz', 'jazz', 'avant garde', 'experimental']
                                        'tag_date'  2003
                                     'discogstags'  ['jazz', 'rhythm & blues', 'vocal']

============================== file details ==============================
                                           'mtime'  1620535755.4882689  (2021-05-09 06:49:15)
                             'size'  1928128