You can use Chrome and Google play music to import your iTunes library on a computer.
Try one of the iTunes apps like iSyncR.
It costs a couple dollars, but it worked for me.
The easiest way is to just plug the phone in and use the computer's file explorer to drag and drop the musing you want from the computer to the phone. No extra software or apps needed.
Open the folder where your music lives on your computer and open a second window to where you want the music to live on your phone and drag and drop.