Thanks to Shazam's services and products, we no longer have to spend hours wondering about the title of a song we heard in passing or wait to hear it again to find out who sings it. With Shazam, consumers can instantly find song, movie, or product information at the touch of a button, without even requiring a search engine. The foresight of the company's four founders made possible one of the early smartphone apps now used by over 400 million people. Their stories and the development of this remarkable business are chronicled in this volume.