I dragged and dropped a bunch of music files from my Mac onto my Moment's SD card. In the Android music player, many of the albums (classical, mostly), were all jumbled together in an "Unknown artist" file. The instruction book for the phone says I should not use my computer to create new folders, or rename folders, on the SD. HOw, then do I delete and rearrange music files? I don't see a prompt for creating folders in the app on the phone.