How to play music from my stereo via usb?

If you have an rca to 3.5mm jack cable, you can plug it into your home stereo's input in the back and connect your phone to it via the earphone input. Then you just select the right source on your stereo and you're all set.

For your car, if there's a similar auxilliary input that you can connect a stereo jack to, you can also connect via the earphone input. If your car has no input like that then another solution is to use an fm transmitter.

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Thanks for your suggestions

So if I add an internal SD card, fat 32, both systems should be able to see it?

Cheers

Thanks IronSingh, Interesting points... I'll try this during the weekend to see what happens!

The reasons why I don't like the idea of having a separate usb drive are that I need to:
1 synchronize music files between my phone, pc AND usb drive;
2 remember to always carry the usb drive with me.
That's why I'd prefer to connect it via an usb cable which is already there.

If all fails I'll use an old rca cable and solve the problem that way, but it looks anachronistic to me! I used it with my first usb player many years ago and it was not comfortable to control the music from the device instead of using the original stereo controls.
Also, I would need two cables, one for recharging, the other for playing.

Cheers

Working Solution
http://www.samsunggalaxysforum.com/hardware-problems/hooking-up-galaxy-s-to-car-radio-via-usb/