{
  "@context": "https://www.w3.org/ns/activitystreams",
  "summary": "Sally listened to a piece of music on the Acme Music Service",
  "type": "Listen",
  "actor": {
    "type": "Person",
    "name": "Sally"
  },
  "object": "http://example.org/foo.mp3",
  "instrument": {
    "type": "Service",
    "name": "Acme Music Service"
  }
}