How to delete songs off my iPhone 4 without syncing?

I want to keep some music and I have a laptop that's not synced, and it will erase all my songs on my iPhone 4 but I do want to delete some songs without syncing. How do I do that?

On my iphone 4 i go to music got to edit and then it says delete and it just delete it you can always get it back though

Well, you need to delete the songs via itunes sync

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