Question: What is the Discogs artist ID for Aphex Twin that has the pseudonym GAK?
Paraphrase: What is Aphex Twin's Discogs artist ID that has the pseudonym GAK?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q223161 p:P742 ?s . ?s ps:P742 ?x filter(contains(?x , 'GAK')) . ?s pq:P1953 ?value}