How to delete music off my iphone 4 that i put on a long time ago?

I have music on my iphone 4 that i have put on a long time ago and now i don't know what to do to delete it off my phone. Because i want to update my music selection, and i donteven listen to it anymore so i don't want on there. So how do i take it off? I need help as soon as possible please!

Remove it from the list of songs you want synced to it in iTunes, or on the iPhone itself in the song list you should be able to swipe to the right to delete a song

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