Hmmm. Maybe it's just a mindset issue. I've never had any[b/] problem with the current UI. I can find any playlist in a matter of seconds. Now, I don't have a full 120GB empeg, but I do have hundreds of playlists, and I don't have any artificial constructs, either, like A-C lists or anything. Just a big flat list of all the artists with albums underneath, plus a few other random things.

I don't think that you will see vertical menus happen, but if you do, I hope that the horizontal ones don't go away.
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Bitt Faulk