How to play songs over a iphone call for both parties in call?

Yes, my online research experience has failed me. As i can't seem to find the solution for this question. I'm RAGED, for the last 3monts i'm having trouble figuring out how to dedicate a song to my Girlfriend while talking to her on the phone. In other words i want to play a song from my library, so that both me and her can enjoy it while talking to each other. Does any Cydia app or app store app exist?

Added (1). I'm actually looking for a tweak like the old nokia phones where, you can play music on the music player and the other person including you can listen to it at the same time. I'm on ios5 iphone 4.

You have to get the service from your service provider then only you can do that.

If you are near a computer that has the music, plug in the sound output from your computer into your phone. You will not be able to hear the music, or be able to talk to the other person though.

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