I recently got my very first MP3 player, an NWS706F, and I'm very pleased with it. I've been transferring some of my CD's using ATRAC 64kbps, and I'm very surprised at how good they sound - from what I've read in various news-groups, such a low sampling rate should sound terrible, but it doesn't. But I'm wondering if I really *should* be using ATRAC Lossless instead. I've done a couple of tracks using both and have switched from one to the other, and can't decide whether I can hear much of a difference - but the switching takes a few seconds, so it's hard to compare. And I might find I can tell the difference if I upgrade my headphones. I'd like to put really long works on the player - symphonies lasting the best part of an hour - so 4GB won't last long if I use Lossless all the time. I know I could probably keep everything on my computer and put it on the player as needed, but I prefer the convenience of having it all on there permanently. So I'd like your opinions - is it better to use ATRAC Lossless than ATRAC 64kbps? Or would MP3 be a good compromise, and if so, what sampling rate would people here recommend? Thanks in advance.