what is the {performer} for {Symphony No. 9} has {date of first performance} as {1824-5-7} ?
Who performed Symphony No. 9 for the first time on May 7th, 1824?
SELECT ?value WHERE { wd:Q11989 p:P1191 ?s . ?s ps:P1191 ?x filter(contains(YEAR(?x),'1824')) . ?s pq:P175 ?value}
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q11989> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1191> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <1824-5-7> .
?statement <http://www.wikidata.org/entity/P175> ?value. 
} 

Symphony No. 9 was performed for the first time on May 7th 1824 by who?