Victory music when enemy dies, help

Hi!

I am having issues creating a victory music for my game.
I am making a 2d platformer where the main character tries to save her grandma from an evil plant.
What I want to happen is that when the plant boss dies it would stop playing my level music and switch into another soundtrack + open a door to release the granma.
But my unity keeps popping up with 17 error codes and I am confused. I always end up erasing any changes I make because of that.

Here is the script that actually works:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Enemy : MonoBehaviour
{
public Animator animator;
public int maxHealth = 100;
int currentHealth;
public GameObject disabler;

//    public float attackRange = 0.5f;
//    public int attackDamage = 40;
//    public Transform attackPoint;
//    public LayerMask playerLayers;

//Set health to max health
void Start()
{
    currentHealth = maxHealth;
}
//Calculate damage
public void TakeDamage(int damage)
{
    currentHealth -= damage;

    //Play hurt animation
    Debug.Log("Enemy got hit!");
    animator.SetTrigger("enemy_hit");

    //Kill when health goes under 0
    if (currentHealth <= 0)
    {
        Die();
    }
}
//Play death animation and disable enemy
void Die()
{
    
    animator.SetBool("enemy_dead", true);

    //Disable enemy
    GetComponent<Collider2D>().enabled = false;
    if (gameObject.tag == "Enemy")
    {
        Debug.Log("Enemy died!");
        GetComponent<PingPong>().enabled = false;
    }
    if (gameObject.tag == "Boss")
    {
        Debug.Log("Boss died!");
        disabler = GameObject.FindWithTag("BossDisable");
        Behaviour[] behaviours = disabler.GetComponentsInChildren<Collider2D>();
        foreach (var item in behaviours)
        {
            item.enabled = false;
        }

// disabler.GetComponent().enabled = false;
// GameObject disableall;
// disableall = GameObject.FindGameObjectsWithTag(“BossDisable”).SetActive(false);
}
this.enabled = false;
}

// Damage the player
// void Attack()
// {
//    //Attack animation
//    //animator.SetTrigger("vesimeloni_attack");
//
//    Collider2D[] hitPlayer = Physics2D.OverlapCircleAll(attackPoint.position, attackRange, playerLayers);
//
//    //Damage the player
//  foreach (Collider2D player in hitPlayer)
//    {
//        Debug.Log("Player got hit!");
//        player.GetComponent<PlayerCombat>().TakeDamage(attackDamage); 
//   }
// }

//Draw sphere to damage collider
// void OnDrawGizmosSelected()
// {
// if (attackPoint == null)
// return;
//
// Gizmos.DrawWireSphere(attackPoint.position, attackRange);
// }
}

What do I need to add to that to make the changes I want happen?
Any help is appreciated, thank you.

Try adding an audiosource to the enemy with this scrip. After that, in the Die function, add gameObject.GetComponent<Audiosource>().Play().