import ddf.minim.*; Minim minim; AudioPlayer player; int size = 1; void setup(){ size(500,300); minim = new Minim(this); player = minim.loadFile("yourfilename.mp3"); player.play(); //player.loop(); background(0); } void draw(){ background(0); if(player.isPlaying()==false){ player.rewind(); player.play(); //player.play(0); size=1; } else { size+=2; ellipseMode(CENTER); noStroke(); fill(255,0,0); ellipse(width/2,height/2,size,size); } }