Transfer music from IPhone to PC?

I have an ITunes account and I'm connected via IPhone and my Sony notebook. My Sony Is however, not in sync with the ITunes on my IPhone. I have downloaded tons of songs with my ITunes on the Iphone and I would think that once I log into ITunes on my laptop it would contain the same songs, but it does not. How can I get the music from my ITunes on my iPhone to the ITunes on my laptop?

You can't. Apple won't let you because they think people will go around stealing music if you could.

You may take a look at this step by step guide, it's about how to transfer files from iPod touch and iPhone to computer iTunes, it supports Apps, Contacts, Songs, Videos, Photos, Playlist, Games, etc. Data files. Easy to understand and works pretty well for my iPod touch.
http://my-media-tools.posterous.com/ipadiphoneipod-transfer-tools

Due to that the iTunse seems to be unable to be used for transferring, you must try another way. I think you can try the iStonsoft iPhone to computer transfer.

There would be a detailed tutorial following:

You just need to do as the above-mentioned steps, and the transferring would be easily finished.

You can use Syncios iPod Transfer to have a try. It supports transferring images, videos, music between iPod and PC freely!
http://www.syncios.com