Early MP3 players didn't have any better logic than to just search for all the songs no matter how they were filed, then let you play them in sequence or random. They had a linear index and it was easy to jump to songs in another folder when one folder was exhausted. Now with category sorting the indexing is more complicated and requires a bit more input to know how to proceed through a list. Our current problem is that the P2 doesn't give us any way to add extra instructions except through a playlist. I don't use playlists, so can someone who does and also uses folders tell me if you can add a folder as one item in a playlist, and make a playlist of folders to move sequentially through?