Concert: Multiple Performers

concert-multiple-performers.js

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "MusicEvent",
  "name": "Shostakovich Leningrad",
  "startDate": "2014-05-23T20:00",
  "location": {
    "@type": "MusicVenue",
    "name": "Chicago Symphony Center",
    "address": "220 S. Michigan Ave, Chicago, Illinois, USA"
  },
  "offers": {
    "@type": "Offer",
    "url": "/examples/ticket/12341234",
    "category": "primary",
    "price": "40",
    "priceCurrency": "USD"
    "availability": "http://schema.org/InStock"
  },
  "performer": [{
    "@type": "MusicGroup",
    "name": "Chicago Symphony Orchestra",
    "sameAs": "http://cso.org/"
  },{
    "@type": "Person",
    "image": "/examples/jvanzweden_s.jpg",
    "name": "Jaap van Zweden",
    "sameAs": "http://www.jaapvanzweden.com/"
  }],
  "workPerformed": [{
    "@type": "CreativeWork",
    "name": "Britten Four Sea Interludes and Passacaglia from Peter Grimes",
    "sameAs": "http://en.wikipedia.org/wiki/Peter_Grimes"
  },{
    "@type": "CreativeWork",
    "name": "Shostakovich Symphony No. 7 (Leningrad)",
    "sameAs": "http://en.wikipedia.org/wiki/Symphony_No._7_(Shostakovich)"
  }]
}
</script>

sorry to bother you @patrickcoombe

please can you add a Comma to the end of line 17 - https://gist.github.com/patrickcoombe/3d0c0a1eec3486109c71#file-concert-multiple-performers-js-L17

Fix these issues to make the page eligible for relevant rich results in Google Search