======================== unified (from filesystem) ========================
                                         'bitrate'  '192.0'
                                        'duration'  '197'
                                          'artist'  'Johnny Cash'
                                     'text_people'  ''
                                         'release'  'The Very Best Of'
                                           'title'  "There Ain't No Good Chain Gang"
                                           'quals'  ("['Q-HAP-3', 'Q-JZFKS-1', 'Q-UNU-1', 'Q-OLDST-3', 'Q-HHRNBTT-1', "
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 "'q-chart-4', 'q-drums-3', 'q-other-2', 'q-piano-1', 'q-vocals-3', "
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                                      'lastfmtags'  "['country', 'singer songwritergdchill', 'cover', 'singer songwriter']"
                                     'discogstags'  "['rock', 'blues', 'folk, world, & country']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  '12'
                                      'tracktotal'  ''
                                            'date'  '2001'
                                        'comments'  ''
                                           'genre'  'loc-namerica-country'
                                             'bpm'  '112.7'
                                             'key'  '6B'
                                        'acoustid'  ''
rest: ''

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

'TALB' (Album/Movie/Show title)                     'The Very Best Of'
'TBPM' (BPM (beats per minute))                     '112.7'
'TCON' (Content type, a.k.a. Genre)                 'loc-namerica-country'
'TDRC' (Recording time)                             '2001'
'TIT2' (Title/songname/content description)         "There Ain't No Good Chain Gang"
'TKEY' (Initial key)                                '6B'
'TPE1' (Lead performer(s)/Soloist(s))               'Johnny Cash'
'TRCK' (Track number/Position in set)               '12'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '3'
'TXXX:Q-UNU'                                        '1'
'TXXX:discogstags'                                  ['rock', 'blues', 'folk, world, & country']
'TXXX:lastfmtags'                                   ['country', 'singer songwritergdchill', 'cover', 'singer songwriter']
'TXXX:q-bass'                                       '4'
'TXXX:q-busy'                                       '2'
'TXXX:q-chart'                                      '4'
'TXXX:q-drums'                                      '3'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '2'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '3'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '3'
'TXXX:replaygain_track_gain'                        '+1.23 dB'
'TXXX:replaygain_track_peak'                        '0.386486'

========================== row from database ==========================
                                              'id'  1496122
                                            'path'  /data/Music/Bulk/00singer-songwriter-eos/Johnny Cash_/Man In Black (The Very Best Of)/Cd 2/12 - There Ain_t No Good Chain Gang.mp3
                                         'working'  None
                                         'bitrate'  192
                                    'duration_sec'  197
                                           'genre'  loc-namerica-country
                                        'filesize'  4740330
                                           'mtime'  1621630287
                                   'redo_metaread'  0
                                        'rest_str'   00singer songwriter eos Cash_ Man In Black (The Of) Cd 2 12 Ain_t loc namerica country
                                      'tag_artist'  Johnny Cash
                                     'tag_release'  The Very Best Of
                                       'tag_title'  There Ain't No Good Chain Gang
                                             'bpm'  112.7
                                    'search_title'  'ain':2 'aint':4 'chain':7 'gang':8 'good':6 'no':5 't':3 'there':1
                                   'search_artist'  'cash':2 'johnny':1
                                  'search_release'  'best':3 'of':4 'the':1 'very':2
                                     'search_rest'  '00singer':1 '2':13 'ain':14 'black':7 'cash':4 'cd':12 'country':18 'eos':3 'in':6 'loc':16 'man':5 'namerica':17 'of':10,11 'songwriter':2 't':15 'the':8,9
                                    'search_combo'  '00singer':15 '2':27 'ain':2A,28 'aint':4A 'best':13C 'black':21 'cash':10B,18 'cd':26 'chain':7A 'country':32 'eos':17 'gang':8A 'good':6A 'in':20 'johnny':9B 'loc':30 'man':19 'namerica':31 'no':5A 'of':14C,24,25 'songwriter':16 't':3A,29 'the':11C,22,23 'there':1A 'very':12C
                                    'tag_tracknum'  12
                                      'num_images'  0
                                             'key'  6B
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-3', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-3', 'Q-OLDST-3', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-2', 'q-drums-3', 'q-syn-1', 'q-chart-4', 'q-other-2', 'Q-HAP-3', 'q-bass-4', 'q-grit-2']
                                      'lastfmtags'  ['country', 'singer songwritergdchill', 'cover', 'singer songwriter']
                                        'tag_date'  2001
                                     'discogstags'  ['rock', 'blues', 'folk, world, & country']

============================== file details ==============================
                                           'mtime'  1621630286.5720417  (2021-05-21 22:51:26)
                             'size'  4740330