machine_question: what instrument does fela kuti play and invented by Adolphe Sax
question: What is the name of the instrument invented by Adolphe Sax and played by Fela Kuti?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ns:m.01tw0t)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ns:m.01tw0t ns:music.group_member.instruments_played ?x .
  ?x ns:law.invention.inventor ns:m.013xf . 
  }
webqsp_question: what instrument does fela kuti play