hi - my son has the samsung d600 and we used the cd that came with the phone - if you dont have the cd you can probably download the software from the samsung website - its called Samsung PC Studio 3. You just install it on the pc, open it up and connect your phone via the usb. You then need to go to 'Manage Files' and it will show your phone in the top left hand corner. You then search your computer for where your music files are stored and then drag and drop each tune into the 'music' bit of your phone menu. each tune takes a few minutes to do - it was a bit fiddly as first but once you get used to it its okay.Hope this helps.