How to play music through two separate speaker systems through an iphone at the same time?

My brother is having a party, and one speaker system needs to be at one end of the house, and the other system at the other end. How can I play music from the one iphone onto the two systems at the same time?

Easy… Get an earphone splitter. It allows you to plug in two audio jacks in your iphone http://www.amazon.com/...B000OVBVOO

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