I'm not able to transfer music from ITunes Library to IPhone 4?

I have only recently bought IPhone 4, I have also done sync, but I'm not able to transfer. I have transferred songs from my PC to ITunes but from there I'm not able to transfer it to phone
Pl.guide step by step thanks in advance

On mine I prefer just highlighting and copy, then click the phone or ipod and click edit-paste, I prefer doing it manually that way. The bottom line with itunes is just click file-add folder to library and add your songs in the list. Connect your phone or ipd, the rest is all easy to figure out after that.

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