{ "items" : [
    { "id" : "http://dbpedia.org/resource/Sound_generator"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "A sound generator is a vibrating object which produces a sound.  There are two main kinds of sound generators (thus, two main kinds of musical instruments)."] } } }
