tapping into bluetooth signal

I am working on a project that uses plays music through a speaker via Bluetooth but also flashes lights based on the frequency. I used this instructable to make the color organ:


It works fine when I use the audio splitter and just connect my phone and the speaker to the circuit, but I wanted to know if it were possible to connect my phone via Bluetooth to a Bluetooth speaker and achieve the same results.

Is there a way to tap into the Bluetooth receiver in the speaker to split the signal so one goes into the speaker while the other goes through the color organ circuit?

Is this possible or would I need to buy a driver and pair that with a Bluetooth module instead of using a pre-existing Bluetooth speaker?

If it is, any direction on what to do to get that result (or any advice in general) would be much appreciated!