How to put music on iTunes from iPhone?

My other laptop decided to shut itself, I mean it works just after the start up it's a black screen, so I can't back up my things and now I have a back up laptop which was meant for tafe, now I would like to update my music since I'm getting bored of my playlist but I can't, how can I get my music from my phone onto iTunes on the current laptop I'm using

You can't use iTunes to backup music unless you purchase your music from iTunes. So you will have to use a third party program like sharepod 3.9.9 or syncios to backup your music to pc. Then you can import your music into iTunes.