How do I delete the songs that came with my cell phone Nokia?

So i even have to USB wire to connect it to my pc, but I can't delete the songs that came with the cell phone cuz they are protected. There must be something I can download that will delete anything I pick, so what can I use?How do I delete the songs that came with my cell phone Nokia?
i don't know any way you could delete those songs from your phone everything,. that's is protected in cell phones is not possible to delete including pictures songs and ring tones.