I have many many mp3s, organized and archived on an external hard drive. What I would like is to have these MP3s show up in iTunes when the hard drive is hooked up, and preferably not when the drive isn't there, all while having the local library there as well. Is this a possibility? I've only begun researching this, and found ways of having the entire iTunes library be on a separate drive. I'm wondering if maybe sym-links rather than aliases may get me there. I could also set up an applescript to swap libraries, I guess, but I'd rather it all be automatic if possible. Thoughts?