Hate the sound of cell phones ringing? Music producers don’t. For them, ring tones are a huge and growing business. “In 2004, your average record company executive is more likely to stifle a cheer every time he hears a tinny version of a chart hit bleeping from a nearby Nokia. According to some sources, the mobile phone ringtone has come to save the music industry. Last year, mobile phone users spent $3 billion on them. They account for 10% of the world’s music market.”