Question: Which genre of music from the USA has a popular example in Ralph Stanley?
Choices: bluegrass music
post-punk revival
Mandopop
New Age music
Punk blues
groove metal
symphony
old-time music
Tejano music
roots rock
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "music genre" . ?e <country_of_origin> ?e_1 . ?e_1 <pred:name> "United States of America" .  ?e <famous_people> ?e_2 . ?e_2 <pred:name> "Ralph Stanley" .  }
Program:
function: Find
inputs: United States of America
function: Relate
dependencies: 0
inputs: country of origin
backward
function: FilterConcept
dependencies: 1
inputs: music genre
function: Find
inputs: Ralph Stanley
function: Relate
dependencies: 3
inputs: famous people
backward
function: FilterConcept
dependencies: 4
inputs: music genre
function: And
dependencies: 2
5
function: What
dependencies: 6
Answer: old-time music