Question: What is the Hornbostel-Sachs classification of the piano used by the celebrity named D'Angelo?
Choices: 412.132
321.322
511
314.122-5
211.11
422.212-71
211.11-922
531.1
321.322-5
211.212.11
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "piano" . ?e <famous_people> ?e_1 . ?e_1 <pred:name> "D'Angelo" .  ?e <Hornbostel-Sachs_classification> ?pv .  }
Program:
function: Find
inputs: D'Angelo
function: Relate
dependencies: 0
inputs: famous people
backward
function: FilterConcept
dependencies: 1
inputs: piano
function: QueryAttr
dependencies: 2
inputs: Hornbostel-Sachs classification
Answer: 511