AT&T has added another music phone to its portfolio, the LG CU575 trax. The trax is a quad-band GSM/EDGE and dual-band UMTS/HSDPA 3G clamshell. It has an external touchpad that lets users access their music, stereo Bluetooth, and a microSD slot that supports cards up to 4GB for media storage. The trax has a 1.3 megapixel camera and is also compatible with AT&T’s 3G services, such as Video Share. It goes on sale August 14 for $129.