Itunes question

So I just bought a new laptop, is there an easy way to get the music from my desktop onto my laptop so I can use itunes on them both. I know I previously made the mistake of syncing my itouch on a different machine and it wiped off all the music on the itouch fml. Is there a better way of having itunes on 2 machines? For Free or cheap?

 

I share my music folder over my home network. If you want to physically move the music, there is the option of a USB transfer cable or an external drive.