mutation {
  MergeMusicCompositionComposer(
    from: {identifier: "ff562d2e-2265-4f61-b340-561c92e797e9"}
    to: {identifier: "cd79f87e-39f3-44bc-ae2f-b9854ab6df3b"}
  ) {
    from {
      identifier
    }
    to {
      identifier
    }
  }
}