BIB-348

[
  {
    "348": {
      "ind1": " ",
      "ind2": " ",
      "subfields": [
        {
          "a": "vocal score"
        },
        {
          "b": "code for vocal score"
        },
        {
          "2": "code for source vocabulary"
        }
      ]
    }
  },
  {
    "348": {
      "ind1": " ",
      "ind2": " ",
      "subfields": [
        {
          "a": "vocal score 2"
        },
        {
          "a": "piano conductor part"
        }
      ]
    }
  }
]

{
  "mainEntity": {
    "musicFormat": [
      {
        "@type": "MusicFormat",
        "label": [
          "vocal score"
        ],
        "code": [
          "code for vocal score"
        ],
        "source": {
          "@type": "Source",
          "code": "code for source vocabulary"
        }
      },
      {
        "@type": "MusicFormat",
        "label": [
          "vocal score 2",
          "piano conductor part"
        ]
      }
    ]
  }
}