(courtesy-Mac Expert Guide)
To evacuate standard Apple programs like iTunes, you need first to debilitate Apple System Integrity Protection (SIP). The SIP innovation constrains the activities that the client can perform on secured portions of the Mac working framework. Pursue the means beneath to debilitate Apple SIP and uninstall iTunes. Restart your Mac and press Command+R key alternate way while the reboot is in advancement. You will see a bizarre startup window – this is the recuperation mode. In the Menu bar click Utilities → select Terminal. In the Terminal window glue the accompanying direction and press the Return key: csrutil debilitate. The Apple System Integrity Protection will be debilitated. Restart your Mac and login to your framework through your administrator account. This is discretionary as you can expel default applications just on the off chance that you have the chairman rights. In the event that you have marked into your director account, type the order compact disc/Applications/and snap the Return catch. The application registry will be appeared. Presently utilize the accompanying direction to erase the default Apple application.