Question: John Cale, who has a Hornbostel-Sachs classification of 513, uses what class of instruments?
Choices: sampler
mellotron
harpsichord
clavinet
xylophone
concertina
Wurlitzer electric piano
Hammond organ
drum machine
electric violin
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "class of instruments" . ?e_1 <instrument> ?e . ?e_1 <pred:name> "John Cale" .  ?e <Hornbostel-Sachs_classification> ?pv . ?pv <pred:value> "513" .  }
Program:
function: Find
inputs: John Cale
function: Relate
dependencies: 0
inputs: instrument
forward
function: FilterConcept
dependencies: 1
inputs: class of instruments
function: FindAll
function: FilterStr
dependencies: 3
inputs: Hornbostel-Sachs classification
513
function: FilterConcept
dependencies: 4
inputs: class of instruments
function: And
dependencies: 2
5
function: What
dependencies: 6
Answer: clavinet