I recently purchased the Halo 4 official soundtrack and it came with a card to download 6 free tracks which i downloaded. They play fine on my computer, but I've tried a number of times to put them on my Symbian S40 phones, and it says they do not recognize the file format. Is it because the songs are compressed at 320kbps? is it legal to use VLC media player to change it to 128kbps?