How to I play music from my iPhone 4s to my car stereo without the use of bluetooth?

I drive a 2001 Jeep Cherokee and the stereo in it doesn't allow for bluetooth pairing obviously, so i'm wondering how I can play music from things like Pandora, Youtube, Spotify, etc to the radio. Do I need to buy some kind of cable or something?

Aux cord

You can use an FM transmitter. I've had good luck with the GoGroove FlexSmart. You actually connect from your phone to the device over bluetooth, but the device converts it over to FM so it works with older stereos. I have the GoGroove FlexSmart x2, but it looks like the x3 is now available:

http://www.amazon.com/...00BMYQTYE/

You can also still get the x2 for a little bit less money.

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