How to transfer music off iPhone onto iTunes?

I recently switched over from Blackberry to iPhone. I currently have 200 songs on my phone that I synced from my desktop computer. I have an additional 50 I'd like to add from my laptop but when I select sync music, it says it will delete all my existing music since it's not on that computer.

My question is, how do I sync the music from my iPhone onto the iTunes so that I can add my music?

Under the Devices tab in iTunes on laptop, you need to use one of the existing basic playlist tabs or make your own new playlist tab for all of that music. Drag/drop all the music from iTunes you want into that new playlist. Then sync the whole playlist to the phone and it will port that over. But in the new list also add the original 200 songs you had before for a new total of 250. You can then delete the current playlist or music off the phone and when you sync all of it will cross back over. Best luck.

Download itunes software in pc

Well, i think, there's no option. Download those songs again and sync your iphone with only that pc.

Maybe you just need some music transfer tool that helps you transfer music between iTunes and iPhone without wiping out previous songs. Here is a guide about how to transfer music from iPhone to iTunes: http://www.imobie.com/...itunes.htm Good luck!