How to get music on my iphone onto my computer?

I had originally have my phone hooked up to my boyfriends itunes. We then broke up and i have 637 songs. My mac will not sync my iphone onto my itunes. I want to be able to download new songs but my itunes wants to delete all music on my phone because it is still synched to his itunes. Is there a way to plug my iphone into my computer and download the songs on my phone onto my itunes so that way i don't have to delete all the music or re-download it all?

DiskAid Will Fix Your Problem

www.digidna.net / Tested And Working A bit slow in copying but its nice