How to add mp3 to iphone without having to sync/delete?

So i'm pretty pissed with apple right now. I purchased some audio files and i'm trying to add them to my iphone but it seems impossible to do so. The files are not on my primary computer and i do not have access to my computer for a few months. The computer i'm using has itunes and i can hook my iphone up to it but there's no way for me to add the music without first syncing to this new itunes and in turn deleting everything from my phone.wtf? Can anyone help me with this. I'm beyond frustrated right now. I don't understand why the *** apple is so *** difficult and the samsung Galaxy is looking really good atm. I really need to put the audio onto my phone as soon as possible. Does anyone know any way to get audio that is in mp3 form on a computer (pc btw) onto an iphone 5 without having to delete everything first? Any apps or anything that do this? Any advice would be so appreciated. Also rants about how much apple sucks are welcome here because i presently HATE them with a serious passion for basically *** my life over with their unnecessarily difficult BULLSHIT.

Did you buy your music on iTunes? If you did you should be able to download the music directly on the phone from the iTunes app. No need to connect to the pc.