I need mac/itunes/iphone/music

Ok, so i have an iphone, had music transferred from my moms pc to my phone. I recently got a mac mini for my birthday and i want to copy the music i have on my phone, to itunes on my mac. When i plug my phone to my mac it says it will have to delete all the songs on my phone, and i don't want to do that because the mac doesn't have a disc burner, and i have a few cds… So bottom line is, i want to copy songs on my phone to iTunes on my mac so i can play them from my mac.

Drag and drop them with a flash drive

Just use this app buddy its perfect
http://www.macroplant.com/phonetomac/