User-Generated Content Pioneer iStockphoto Adds Audio Tracks to World's Leading Destination for Stock Images, Videos and Sounds iStockphoto, the world's leading stock multimedia destination, announced its new audio collection today at the SXSW Music Festival. iStock's Standard Audio collection includes over 11,000 royalty-free, user-generated sound effects and music tracks. iStock also debuted a new Pump Audio collection of over 18,000 single-production music tracks. iStock is now the first company to offer stock imagery, video footage, vector illustrations, Flash files and audio for purchase under a single payment model, on one convenient site. iStock is a pioneer in monetizing user-generated content, with contributing artists and customers from nearly every country in the world. iStock shares royalties with its contributing artists currently pays out close to $1.1 million weekly. iStock's Standard Audio tracks start as low as $2 each with Pump Audio tracks as low as $29. Music and sound effects ...