Abstract: A first method and system for customizing a file comprising at least one of audio or video content comprises receiving a baseline file comprising at least one of audio or video content, receiving a first file, and generating a customized file comprising at least one of audio or video content comprising the first file and the baseline file comprising at least one of audio or video content. A second method and system for customizing a media file comprises receiving a first baseline media file, receiving a first customization file, generating a first customized media file comprising the baseline media file and the first customization file, determining one or more customization preferences, and customizing a second baseline media file using the one or more customization preferences to generate a customized second media file in response to a triggering event.