Like a cavalry army, the no-input mixer and feed-backing guitar are fluid and powerful but difficult to control precisely. Siege of Zhongdu is an interactive, electronic feedback loop piece for a trio of no-input mixer and 2 feedback controlled Stratocaster guitars played through hand held Honeytone amps. The no-input mixer controls the output of each feed-backing guitar and integrates their sound in to the loops generated by the mixer, multiplying it's waves. The graphic score is choreographic, indicating physical and sonic gestures, and follows the “innovative” 5 year siege by Mongol conqueror Genghis Khan upon the ancient city of Zhongdu (modern day Beijing). The result, like the siege, is violent, plotting and overwhelmingly successful.