How to add multiple waves and different colours?

Processing Libraries
1 
import processing.sound.*;

SoundFile song;
int n;
Circle[] ellipse;
float ty = 0;
float noiseScale = 0.02;

void setup() {
  size(400,400);
  
  song = new SoundFile(this, "kgf.mp3");
  song.loop();
  
  n =100;
  ellipse = new Circle[n];
  
  for(int i=0; i<n; i++) {
    ellipse[i] = new Circle(i);
  }
}

void draw(){
  background(0);
  
  for(int i=0; i<n; i++) {
    ellipse[i].display();
  }
}

class Circle{
  //  float noise;
  //  //int index;
  //  color c;
  
  Circle(int index) {
  //    //x = random(width);
  //    //y = random(height);
  //    //this.index = index;
  //    //noise = 0.0000000001;    
  //    //int randomColor = int(random(1,4));
  //   // c = color(255, 255,255);
  }
  
  void display() {
    
    //noStroke();
    // fill(130, 5);
    float tx = 0;
    float x = 0, y = 0;
    
    for(int i = 0; i < width; i++) {
      stroke(noise(x*y)+100, 20,20 );
      // stroke(c);
      ellipse(i*5,noise(tx,ty)*width, 50, 5);
      tx += map(i, 0, width, 0.00001, 0.1);
      
      //x++;
      //y++;
      frameRate(60);
    }
    ty += map(20, 0, height, 0.00001, 0.1);
  }
}