what variations of a english concertina are there?
Entity
m.0g2ff
Concertina
class entity
music.instrument m.05_jw_q
music.instrument music.instrument
Musical instrument English concertina
none none
music.instrument.variation
Variations
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :music.instrument . 
VALUES ?x1 { :m.05_jw_q } 
?x0 :music.instrument.variation ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND music.instrument (JOIN music.instrument.variation m.05_jw_q))