I have an iPhone 4 and a Lenovo laptop. How can I upload my music to my computer?

I only want to add a few songs to my computer and don't want to go over any data usage available. I'm desperate, so please help me! Also, I want to convert my music (once on the computer) to movie-maker where I'll add it to a clip. Again, please help!

There's an app coming soon in the market with the name of Folder Lock for iPhone, it gives you the feasibility to connect your iPhone with the PC without any data capable. You will just need a Wi-Fi connection for that. It will secure your data and as well as through you will be able to transfer data from PC to iPhone and vise versa very easily.
But you need to wait a bit for that

You have to use itunes.