New itunes help

[illachilla]

I have a new computer with music on it and would like to add it to my phone without erasing my old iTunes that's already on there. Help please.

 

[PavtubeVideo]

You can switch iTunes to manual sync mode, in that way you can use iPhone like a USB device.
Find a guide here: http://www.iphoneforums.net/forum/p...ow-copy-movies-pc-iphone-5-manual-sync-46394/