Question: Which rock music is the genre of the band whose official website is http://www.porcupinetree.com?
Choices: space rock
progressive rock
psychedelic rock
hard rock
industrial rock
art punk
Skate punk
progressive metal
traditional heavy metal
art rock
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "rock music" . ?e_1 <genre> ?e . ?e_1 <pred:instance_of> ?c_1 . ?c_1 <pred:name> "band" . ?e_1 <official_website> ?pv . ?pv <pred:value> "http://www.porcupinetree.com" .   }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: official website
http://www.porcupinetree.com
function: FilterConcept
dependencies: 1
inputs: band
function: Relate
dependencies: 2
inputs: genre
forward
function: FilterConcept
dependencies: 3
inputs: rock music
function: What
dependencies: 4
Answer: progressive metal