Thanks for the question. To clarify, you can already stream music via Bluetooth. However, you can connect a SoundTouch Wireless link adapter to your Wave Music IV. Which essentially turns in to a SoundTouch wireless system. You can stream music using your home WiFi internet and get access to your favorite online music streaming services. The connection from the adapter would be the 3.5 audio cable into the AUX port located on the back of your Wave system.
Hope that helps!