JS1k: The JavaScript code golfing competition

A=new AudioContext();Z=Y=X=29;
function D(){for(x=99;x--;c.arc(650+(z=Math.cos(Z)*3)*8,300+Math.sin(Z)*7,x*7,X,X+4))c.beginPath(c.stroke()),c.strokeStyle=`hsl(${x-t*X},90%,30%)`;t++;c.drawImage(a,-z,-z,a.width+z,a.height+z)}
function M(){G=A.createGain();G.gain.value=.3;G.connect(A.destination);C=A.createDynamicsCompressor();C.release.value=0;C.connect(G);O=A.createOscillator(o=A.createOscillator(X=(T+=4.21)%16+Y+z*z*z));o.frequency.setValueAtTime(X,y=A.currentTime);o.connect(C);O.frequency.setValueAtTime(Y=Z+X/Y*Z*2,y);O.connect(C);o.start(y);o.stop(y+.3);O.start(y),O.stop(y+.32);Z^=8*Z/Y};setInterval(D,t=6);setInterval(M,T=250)

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