Play music from iPhone through car stereo?

I have an older car with a cassette player but its broken and none of the cassette adapters work with it. I have an audio cable and I was wondering if attaching a USB head to one end and having the audio on the other end then plugging that into the cigarette lighter with one of those adapters would play music through my stereo?

That will not work. You can look for the direct integration, depending on the stereo that you have. Check out http://www.gromaudio.com/store/aux_adapters/index.html
If your stereo is in the compatibility list you can simply connect the interface to the back of the stereo, and play your iPhone.
I'm in the search for Android integration, and this is how I found out about GROM Audio.

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