I uploaded my iTunes a while ago, there are some apps that will transfer only 100 songs from your iTunes account to your S4 device before you have to pay for it. So if you have 100 or less, you'll be golden. However, if you are like me and have almost three gigs of music...it's a bit of a hastle, but it's a method that works.
If you have the computer that has your iTunes acct. on it, plug your phone in via USB (Media mode MTP) and when the documents file pulls up, double click the view files. From there you will have one or two choices, memory card and phone, choose phone. navigate through those folders until you see one labeled music, this is the one we will be using.
Next, you will want to pull up your iTunes, try and put the two windows side by side to avoid having to minimize and maximize them. Access your music in iTunes where it is in a list format, shift and left click the songs you want. Next you want to drag those highlighted files over to the music folder in your phone. Drag and drop, it will copy over and do this until you have what you want there!
Because Apple is very fussy with Android sometimes, the music you copied over will be located in "Play Music" which is has an orange headphone icon, that is located in your app drawer. You will find everything in there.
https://play.google.com/store/apps/details?id=mahmed.net.synctuneswirelessfree&hl=en this is the link to the play store I was mentioning earlier with having less than 100 songs, it's free so no worries there. If you need more explanations, i'll do my best to help!
