What is {spouse} of {Roger Waters} that is {start time} is {1976-0-0} ?
Roger Waters' was married in 1976, to whom?
Who was Roger Waters' spouse in 1976?
SELECT ?k WHERE { ?r property:spouse ?k . FILTER ( CONTAINS ( YEAR ( ?g ) , '1976' ) ) . ?r property:start_time ?g . resource:Roger_Waters property:spouse ?r }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q180861> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P26> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1976-0-0>
} 

SELECT ?obj WHERE { wd:Q180861 p:P26 ?s . ?s ps:P26 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1976')) }