How to put music on my iphone without erasing everything?

Normally I use ITunes on my desktop just fine however i also have a laptop that i would like to be able to use as well but when i try putting music on the phone through the iTunes on my laptop it won't let me unless i erase and sync everything on the phone. How do i get around this?

OMG I've been asking this too! I don't know how to do it!

You copy your music from the desktop to the laptop.It'll be in the My Documents\My Music\ iTunes\iTunes Music folder. Copy the iTunes Music folder to the exact same place on the laptop. Then install iTunes on the laptop. ITunes will find it and create a music list. You then sync the iPhone to the laptop iTunes.

I connect my iPod Touch to 2 computers almost every day. I choose the option for "manual management of music and video" and nothing gets erased.

Just click erase and sync and it actually doesn't erase it… I did that and it actually just downloads all content from your phone onto the laptop so that you can put it back on again if it gets erased

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