There are quite a few flaws with Apple's mobile products, and one that drives me crazy is their reliance upon iTunes for all your music syncing needs. If you want a song on your iPhone, you pretty much have to use iTunes to get it on there. Either that or buy it directly from the iTunes app on your slicelive.com: Dallas Thomas. Here are the steps to transfer music from computer to iPhone X/8/7/6 using iTunes. Step 1: Download and install the latest version of iTunes on your computer. Step 2: Connect your iPhone XS/XS Plus/XR to computer, run iTunes, then go to File > Add File to Library, and choose the songs you'd like to copy from computer to your iPhone.