Why can't I sync my phone with more than one computer to get my music from both computers onto my I phone?

Question

So I sync my phone on one of my computers and I get the music I want from that computer....then I plug my phone into another computer and I try to get more of my music files from that computer. The problem is: I tunes wants to delete all the previous files that I synced up with my other computer. SOOOO I can not get separate music files off different computers. Why not? These are all my music files....Will I have to find a way to consolidate all of my music onto one computer? Or is there some way I can get all of my files onto my I-phone?

Answer 1

Which is precisely why I am frustrated with how proprietary Apple is.  No matter how much people try to spout out about the superiority of Apple products, my iPhone should be able to grab music from my laptop and my PC at home, both being authorized already.  I've already tried home sharing.  I didn't buy the iPhone outright, it was provided to me through work.  For all the Apple and Mac only fans, I feel this is Apple's way of trying to make me purchase music I have already bought on CD through iTunes.  Whatever happened to ease of use?  Customer friendly applications?  Anyone else dislike how hard it is to add artwork to an album in iTunes after you load a CD and it doesn't recognize it?  Track by track?  How about offering one simple, convenient copy and paste to album like in Windows?  Oh, yeah, so you give up and buy it again in iTunes.  I do like the interface on the iPhone or iPod once things are working properly, however the hoops you jump through are ridiculous.  I want to load music off of my laptop, after having most of my library on another PC, and it won't work without deleting the library off of the phone.  What is the point of authorizing up to 5 computers if you can't use your music from those different machines?  There, I'm getting off of my soap box now.