How many people have worked in the band one of whose current member is Hynief?
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/currentMembers> <http://dbpedia.org/resource/Hynief> . ?x <http://dbpedia.org/ontology/bandMember> ?uri  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Person>}
Hynief