Random sounds in Phaser

the-scene.ts

import {Scene} from 'phaser';

export default class extends Scene {
  private sounds: Phaser.Sound.BaseSound[] = [];

  create() {
    this.sounds.push(this.sound.add('song_1', '<url>', etc...));
    this.sounds.push(this.sound.add('song_2', '<url>', etc...));
    this.sounds.push(this.sound.add('song_3', '<url>', etc...));
    this.sounds.push(this.sound.add('song_4', '<url>', etc...));
  }
      
  update() {
    if (this.input.whateverButton.isDown) {
      // Pick a random sound
      var index = Math.round(Math.random() * this.sounds.length);  
      var sound = this.sounds[index];
      
      // Play it
      sound.play();
    }
  }
}