Music.cs

using System.Collections.Generic;
using UnityEngine;

public class Music : MonoBehaviour
{
    public List<AudioSource> musicClips = new List<AudioSource>();
    public GameObject music1;
    public GameObject music2;
    public GameObject music3;
    public Texture2D icon;

    void Start()
    {
        
    }

    void OnGUI()
    {
        if (GUI.Button(new Rect(60, 75, 30, 30), icon))
        {
            /*for (int i = 0; i < musicClips.Count; i++)
            {
                if (musicClips[i].isPlaying && i != musicClips.Count - 1)
                {
                    musicClips[i].Stop();
                    musicClips[i + 1].Play();
                }
                else if (musicClips[musicClips.Count - 1].isPlaying)
                {
                    musicClips[musicClips.Count - 1].Stop();
                    musicClips[0].Play();
                }
            }*/

            if (music1.activeSelf && music2.activeSelf == false && music3.activeSelf == false)
            {
                //Debug.Log("First audio track is playing");
                music1.gameObject.SetActive(false);
                music2.gameObject.SetActive(true);
            }
            else if (music1.activeSelf == false && music2.activeSelf && music3.activeSelf == false)
            {
                //Debug.Log("Second audio track is playing");
                music2.gameObject.SetActive(false);
                music3.gameObject.SetActive(true);
            }
            else if (music1.activeSelf == false && music2.activeSelf == false && music3.activeSelf)
            {
                //Debug.Log("Third audio track is playing");
                music3.gameObject.SetActive(false);
                music1.gameObject.SetActive(true);
            }

            /*if (!musicClips[0].isPlaying && !musicClips[1].isPlaying && !musicClips[2].isPlaying)
            {
                musicClips[0].Play();
            }
            if (musicClips[0].isPlaying)
            {
                musicClips[0].Stop();
                musicClips[1].Play();
            }

            else if (musicClips[1].isPlaying)
            {
                musicClips[1].Stop();
                musicClips[2].Play();
            }
            else if (musicClips[2].isPlaying)
            {
                musicClips[2].Stop();
                musicClips[0].Play();
            }
            */
        }
    }
}

This script is used to play music in-game, and is attached to the Main Camera. It creates a GUI button in-game, and shows a music icon on it, which the player can click. This allows them to go through all the songs I have added to my game, before looping back to the first song (much like my BackgroundChanger script).