Systems and methods of presenting media objects are described. In one
aspect, a group of media objects is selected from the collection based
upon media object relevance to one or more data structures of a selected
media file of indexed, temporally-ordered data structures. The selected
media file and the media objects of the selected group are presented
contemporaneously. In another aspect, media objects in the collection are
grouped into multiple clusters based upon one or more media object
relevance criteria. The media object clusters are arranged into a
hierarchy of two or more levels. A selected media object cluster is
presented contemporaneously. Systems for implementing these media object
presentation methods also are described.