1. A metadata convergence platform implemented in a digital environment and comprising: a communication system in electronic communication with a first content repository comprising, in digital form, a first content comprising at least a first kind of media, and first metadata comprising attributes respecting the first content, and a second content repository disparate from the first content repository and comprising, in digital form, a second content comprising at least a second kind of media different from the first kind of media, and second metadata comprising attributes respecting the second content, the communication system receiving at least a portion of the first metadata and the second metadata from the first and second content repositories, respectively; a metadata registry accessible via the Internet by a user device, the metadata registry receiving and storing, in digital form, a plurality of metadata schemas including a first metadata schema concerning the first kind of media, and a second metadata schema different from the first metadata schema and concerning the second kind of media; and a control system in communication with the communication system and the metadata registry and configured to: incorporate the first metadata into the first metadata schema to produce a first metadata record; incorporate the second metadata into the second metadata schema to produce a second metadata record; and transmit the first and second metadata records to the metadata registry; the metadata convergence platform being responsive to a query by the user device by: determining that the query corresponds to the first metadata record or the second metadata record; responsive to a determination that the query concerns the first metadata record, locating the first content from the first metadata record in the metadata registry and delivering the first content to the user device; and responsive to a determination that the query concerns the second metadata record, locating the second content from the second metadata record in the metadata registry and delivering the second content to the user device.