Simple rollover animations with image and sounds for mouseX and mouseY

Hello Forum,

I work with a beginning code class of teen-aged students. For the ones who struggle, I have a simple design project where they program a series of images (stop-motion type thinking) to move with mouseX and mouseY. I would like them also to be able to add a sound effect at different places with specific images. I am doing something like the code below but I would like the sound to just play once rather than looping when mouse hovers? And, I am assuming there are better ways to set up roll-over SFX - would love thoughts on how to make the sounds play once and other cool ways to simplify the loading of sound with roll-over images. Thanks!

//SOUND
import ddf.minim.*;
Minim minim;//audio context
AudioPlayer song1;
AudioPlayer song2;
AudioPlayer song3;
AudioPlayer song4;

PImage img1, img2, img3, img4;

//setup
void setup () {
  size (670,237);
  background (255);


  img1 = loadImage("bird1.png");
  img2 = loadImage("bird2.png");
  img3 = loadImage("bird3.png");
  img4 = loadImage("bird4.png");

}

//draw function that loops
void draw () {

  //draw lines to divide quadrants


  //upper left quadrant is red
  if ((mouseX < 150) && mouseY > 0) {
 image(img1, 0,0);
  minim=new Minim(this);
  song1=minim.loadFile("one.mp3",1000);
  song1.play();


  //upper right quadrant cyan
  } else if ((mouseX < 250)&& (mouseY > 0)){
   image(img2, 0,0);
     minim=new Minim(this);
  song2=minim.loadFile("two.mp3",1000);
  song2.play();


  //lower left quadrant gray
   }else if ((mouseX < 340) && (mouseY >0)) {
   image(img3, 0,0);
        minim=new Minim(this);
  song3=minim.loadFile("three.mp3",1000);
  song3.play();


 // lower right quadrant black
  }else if ((mouseX < 440) && (mouseY > 0)){
 image(img4,0,0);
      minim=new Minim(this);
  song4=minim.loadFile("four.mp3",1000);
  song4.play();
  }
}