The SF Chronicle rounds up more information on the business of cell phone ring tones. EMI Music Publishing has banned the ring-tone versions of 300 songs while two rappers have been amongst the first to release new record tracks as ring-tones. These personalized rings are catching on fast in the U.S. with Cingular, AT&T; Wireless, VoiceStream and Sprint ready to sell cell tones. But, thanks to EMI, it looks like cell-toting fans of “The X-Files,” “Star Trek” and “Buffy” won’t be able to go legal ringing their theme songs.