Here's my issue: I get bored very easily of the same songs on my iPhone 4gb. Almost all of my music is ripped from CDs at relatively high quality (320 kbps) mp3s. What I would like to do is have a lower-quality copy of the songs that I use solely on my iPhone. However, it will bug me to no end if multiple copies show up in iTunes during my regular music listening. I thought about renaming the albums or something but I want the real information represented on the phone. Does anyone know of a way to label the songs or organize them somehow so that they: a) don't show up in my regular library b) keep their original album/artist info Thanks so much for any advice! P.S. I believe I've heard that AAC is better/more efficient than mp3, is this true?