Common Anode + R G B light strips are common and cheap on eBay and common Cathode strips ( – RGB) are difficult to find in the UK. Some 12v LED drivers will only drive common cathode LED strips. LightwaveRF JSJS LW574 is such an LED driver – thanks to Err0rC0deX for providing the schematic.

Audio is shocking…sorry, I didn`t see until I replayed it when it was done!