Creating another iTunes library

Currently, almost all of the songs in my iTunes library are AIFF (uncompressed) files, because they simply sound better. I also have quite a few of them that I've digitized from LP's. That takes quite a bit of work, so I don't want to lose them. However, when I finally transfer these to an iPod, I'll want to use a compressed version of those files. Do I create another library, and import the AIFF songs into that library using compression, or what?
Thanks in advance.

You're welcome for the help.
It is really not necessary to "understand the underlying file structure" to understand how iTunes works with files behind the scenes. It is helpful, of course, but not essential. Making a new, lossy MP3 or AAC file from an uncompressed AIFF file is the accepted way to transcode. And this really is the only way for iTunes to do this. Under no circumstances should something like transcoding from one format to another do anything to the original file. Modifying the original file in any way would be very bad. But enough about features and software design.
It would not do you any good to convert a lossy file to an uncompressed format such as AIFF or WAV. The lossy file has data missing, that was thrown away during the conversion process that can't be recovered. In general, most people won't notice, but if you start transcoding and converting to different formats eventually the sound quality of the file is going to degrade to the point that it is useless. As you rightly point out, you can't get back what was never there in the first place.

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