I'm following the instructions from this answer to generate the follow S3 bucket policy:

{
  "Id": "Policy1495981680273",
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "Stmt1495981517155",
      "Action": [
        "s3:GetObject"
      ],
      "Effect": "Allow",
      "Resource": "arn:aws:s3:::surplace-audio",
      "Principal": "*"
    }
  ]
}

I get back the following error:

Action does not apply to any resource(s) in statement

What am I missing from my policy?

From IAM docs, http://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements.html#Action

Some services do not let you specify actions for individual resources; instead, any actions that you list in the Action or NotAction element apply to all resources in that service. In these cases, you use the wildcard * in the Resource element.

With this information, resource should have a value like below:

"Resource": "arn:aws:s3:::surplace-audio/*"