code: func (r *Recording) FriendlyPrice() string {
  	if r == nil {
  		return ""
  	}
  	return price(r.PriceUnit, r.Price)
  }
docs: // FriendlyPrice flips the sign of the Price (which is usually reported from
  // the API as a negative number) and adds an appropriate currency symbol in
  // front of it. For example, a PriceUnit of "USD" and a Price of "-1.25" is
  // reported as "$1.25".