I added music to my external sd card when getting the phone, then added more through a usb connection. i also played around with doubleTwist. Now, ive tried to delete all of my music from the phone, through deleting the ENTIRE sd card as well as using a usb connection, AND going through doubleTwist. nonetheless, i cannot get rid of most of my music! it just will not delete. doesnt show up on my sd card, but whenever i hit the music or doubletwist app, its still there. BUT it doesnt play, just gives some message explaining that the format is incorrect. PLEASE HELP ME!