Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for generating media assets. A method includes sending a first media asset to a plurality of subscribers of a first channel of a plurality of channels. The first media asset includes a first set of media elements. The method also includes analyzing aggregated performance data associated with the first set of media elements and with the plurality of subscribers. The method further includes generating, by a computer processing device, a second media asset comprising a second set of media elements based on the aggregated performance data. The first set of media elements differs from the second set of media elements. The method further includes sending the second media asset to the plurality of subscribers.