Music on iPhone
How do I save the music on my iPhone to itunes on my computer
Windows, Windows 6
Did you not have an external backup for your computer?
You will need to use 3rd party software on your computer to move the music to your computer. I don't know what type of computer you have, if it is a PC I have used TouchCopy for doing this. After you move the music to your repaired computer implement a backup plan for your computer.