San Diego-based Leap Wireless said this morning that it has added music downloading to its suite of Qualcomm BREW-enabled mobile applications. Leap's new RealTone JukeBox application has been added to its Cricket Clicks suite of mobile applications, and allows subscribers to download their favorite music to their mobile phone. The music download service provides clips of music to use as a ringtone. Different clips of music can be associated with different callers on their calling list. Leap's service is priced per song.