How to get music back on my iphone 4 after i restored from a backup?

If you saw my last question you would understand that i downloaded the ios 7 and restored my iphone.well i fixed my problem and now i have a new one. I restored my iphone and got everything back except for the music. This is something i use everyday so its really important to me that i get this back. I lost almost 200 songs and i need help to get them back. The laptop with all my music on it was my schools laptop and i gave that back last week. That was the only way i could get it back. Now i'm using my living room pc and there's itunes on this but its not my library and i don't want my dads 70's music on my iphone… Can someone please help me get my songs back to me?

"The laptop with all my music on it was my schools laptop and i gave that back last week."

Not a problem. Just use the flash drive or CDR you used to copy all that music from the school laptop and copy from that to whatever computer you have.

Can you imagine that there are people who spend hundreds of dollars on computers and related stuff and never bother to do something cheap, quick and easy as save their music to a CD-R?