How do I get all my music from my iPhone onto my new macbook pro's iTunes? My old laptop is broken.

I recently purchased a Macbook Pro as my old Macbook broke. I want to transfer all the music from my iPhone onto the iTunes of my new Macbook Pro, however I cannot do this by moving the tracks onto an external hardrive from the old computer to the new as the old is broken. I've looked at lots of different forums etc. on the internet and I've still had no luck! Please help me !