import ddf.minim.*;

Minim minim;

AudioPlayer player;

void setup(){
  size(500,500);
  
  minim = new Minim(this);
  
  player = minim.loadFile(“yourfilename.mp3");
 
  //player.play();
  player.loop();
  
  frameRate(30);
  background(0);
}

void draw(){
  background(0);
  ellipseMode(CENTER);
  noStroke();
  fill(255,0,0);
  
  println(player.bufferSize());
  
  for(int i = 0; i < player.bufferSize() - 1; i+=2)
  {
    //float w = map(player.left.get(i),-1,1,10,width);  
    float w = 10 + player.left.get(i)*300;
    //println(player.left.get(i) + "," + w);
    fill(color(random(255),random(255),random(255),random(255)));
    ellipse(width/2, height/2, w,w);
  }
  
  
  
}