Question: What sound is associated with the people that make up the Grateful Dead?
Choices: acid rock
neo-progressive rock
country rock
children's music
folk rock
alternative hip hop
noise pop
post-grunge
rock music
emo
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "sound" . ?e <famous_people> ?e_1 . ?e_1 <pred:name> "Grateful Dead" .   }
Program:
function: Find
inputs: Grateful Dead
function: Relate
dependencies: 0
inputs: famous people
backward
function: FilterConcept
dependencies: 1
inputs: sound
function: What
dependencies: 2
Answer: acid rock