1. A computer implemented method comprising: obtaining access to metric values derived from a knowledge base of predefined mediasets, each of the predefined mediasets comprising a plurality of media items grouped together, wherein the metric values reflect a relative frequency within the predefined mediasets in which a first media item and second media item occur together; receiving an initial selection of at least one media item to define an initial input set of media items, wherein the at least one media item occurs within at least one mediaset in the knowledge base of predefined mediasets; and generating an output media item navigation list responsive to at least one media item in the input set of media items, wherein the generating is based on the metric values derived from the knowledge base, and further wherein each media item in the output media item navigation list occurs in at least one mediaset in the knowledge base of predefined mediasets.