How many different genres led to other genres where drums are important?
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/instruments> <http://dbpedia.org/resource/Drum_kit> . ?x <http://dbpedia.org/ontology/stylisticOrigin> ?uri  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/MusicGenre>}
Drum_kit