iTunes in Apple :
iTunes is just one of the software application which has been launched by the Apple company. It is basically the online software media application, which is used to send the desired songs over the internet and even one can save the files or songs according to there choice by paying the required some of money.

How to transfer music from iTunes to iPhone ?
Step 1: First of all open up your computing device.
Step 2: Then after connect your iPhone device to the computer system.
Step 3: Make a proper connection from the iPhone to the device.
Step 4: Start the iTunes in your computer system so that desired music are send to your iPhone.
Step 5: Launch your iTunes app in your device, choose the required songs that you want to send to the iPhone device.
Step 6: Now before all that make a check that you are using the latest version of iTunes. And suppose if not then you need to first of all make it updated through the online web portal.
Step 7: Now as soon as you have connected the iPhone device to the system, then there you will be able to see the iPhone icon on the top of of system screen.
Step 8: Make a double click on the iPhone icon being shown over the system.
Step 9: Choose the ‘summary’ option from the options in the top left side bar of the page.
Step 10: Switch to the box which just next to the ‘manually manage music and videos’ on your required system.
Step 11: Select the desired song from the playlist and then after move to the next step.
Step 12: Click on the apply button which has been shown on the bottom of the page.

But suppose if any guidance is needed in doing so then you may contact to iTunes technical support, service which is available 24/7 hours in a day.