1. A system for automatically selecting thematically representative music, comprising: a processor configured to: retrieve a set of videos related to a set of themes; search, based at least in part on a theme-related keyword, a keyword-indexed video repository to retrieve videos associated with the theme-related keyword; analyze the retrieved videos and select videos including music from the retrieved videos; extract video features from the selected videos; compare the extracted video features of the selected videos to video features of the set of videos related to the set of themes to determine at least one of the selected videos that is thematically similar to at least one of the set of videos; extract a music track of the determined at least one of the selected videos and select the music track as a representative of the corresponding theme; and cause the selected representative music track to be stored in a processor accessible memory.