iTunes on iPhone - How to Delete Songs

Yes, you need to be selective in what songs you sync to your iPhone, either by creating a playlist or only syncing checked items and unchecking the songs you dont want to sync. Then resync, and the songs you did not choose will be removed.

Or, when you do synch, tell it not to synch any songs and they will all be removed from the phone.

instead of sncing to your main itunes library just set up a new playlist in itunes, drag all the music you want onto your iphone into that playlist and then just sync your phone only to that specific itunes playlist.

when you want to add or remove songs just do it from the playlist that you set up and the iphone will sync up with it everytime you plug it in.

Hey mrkjon,

Yes, creating a playlist is how you would sync part of your itunes library.
This article has more detailed information about syncing your iPhone.
http://docs.info.apple.com/article.html?artnum=305741

Jason