Connecting USB to CD Player

Hello friends ,
Is there an option or alternative bluetooth-style path to the CD player in the vehicle where we can upload songs with usb? What is the method and price you use?

You can solve it with digital music changer.

What kind of solution can you give information about, (digital music changer) I have no knowledge about it?

http://www.sahibinden.com/ilan/alisveris-elektronik-arac-elektronigi-kapinda-ode-sok-kampanya-tum-orjinal-teyip-icin-usb-kartgirisli-50889826/detay/

I bought the product above. I assembled it myself. I put it in the torpedo and uploaded the music to the 4gb SD card. Both the joystick works.

Cons.

1. There is a slight sizzle at high volume but it did not bother me much.

2. Up to CD01, CD02 ... CD10, CD11 ... CD99 can be created, says it does not recognize after 10 in the manual. Or I couldn't. By the way, each folder can receive 99 mp3s.

3. Let's say you are listening to music from the SD card, but you wanted to listen to the music on your USB. How to switch when both are installed at the same time? Çözemedim. I don't even mix Aux. But if you want to get sound from usb or sd or aux alone, there is no problem. But it is not known how it happens when both are attached.