machine_question: who is the artist which recorded Soda Pop
question: What work does the artist who recorded "Soda Pop" do?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ?c)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ?c ns:music.featured_artist.recordings ns:m.0yby29k . 
  ?c ns:people.person.profession ?x .
  }
  
webqsp_question: who is michael buble