1. A system, comprising a processor; and a memory communicatively coupled to the processor, the memory having stored therein computer-executable instructions, comprising: a communication component that receives unstructured metadata included in a probe media item, wherein the unstructured metadata comprises a free-form text description of the media item; a matching component that matches the unstructured metadata to structured metadata comprising a structured text description of a reference media item in a reference database based upon a matching function value; and a scoring component that determines a confidence score for the reference media item based upon a scoring function comprised of a first product of the matching function value and a first sum of one and a reference weight, the first product divided by a second sum of a normalized unstructured function value for the probe media item and a second product of the reference weight and a normalized structured function value of the reference media item.