Question: What is the Stack Exchange Tag for the class of instruments where an instrument used by Nelson Riddle falls into ?
Choices: https://stackoverflow.com/tags/unix
https://travel.stackexchange.com/tags/canada
https://stackoverflow.com/tags/gpl
https://wordpress.stackexchange.com/tags/windows
https://stackoverflow.com/tags/havok
https://tex.stackexchange.com/tags/windows
https://music.stackexchange.com/tags/trombone
https://unix.stackexchange.com/tags/php
https://anime.stackexchange.com/tags/osamu-tezuka
https://stackoverflow.com/tags/c%2B%2B
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "class of instruments" . ?e_1 <instrument> ?e . ?e_1 <pred:name> "Nelson Riddle" .  ?e <Stack_Exchange_tag> ?pv .  }
Program:
function: Find
inputs: Nelson Riddle
function: Relate
dependencies: 0
inputs: instrument
forward
function: FilterConcept
dependencies: 1
inputs: class of instruments
function: QueryAttr
dependencies: 2
inputs: Stack Exchange tag
Answer: https://music.stackexchange.com/tags/trombone