Software that allows a mobile device to be used as a karaoke machine; Game software; Software for processing digital music files; Computer software featuring musical sound recordings and musical video recordings; Computer software for communicating with users of hand-held computers; Computer software for manipulating digital audio information for use in audio media applications; Computer software platforms for development of interactive audio applications for use with mobile audio platforms; Computer software to control and improve computer and audio equipment sound quality; Downloadable computer software for mobile devices that enables users to transform and enhance the video and audio capabilities of their mobile devices; Downloadable computer software executable to communicate amongst mobile devices using audio encodings of information; Downloadable computer software executable to provide mobile devices with signal processing capabilities; Downloadable computer software for mobile devices that enables users to interactively perform individualized audio and video applications; Downloadable computer software for mobile devices that enables users to send music, text, audio, video, and graphics information to other users of mobile devices; Downloadable computer software for mobile devices for enabling users to download and share interactive audio and music using mobile devices; Downloadable computer software for mobile devices for personalizing audio and video performances on a mobile device; Computer software programs for the integration of text, audio, graphics, still images and moving pictures into an interactive delivery for multimedia applications