Error Unable to implicitly convert type 'UnityEngine.SceneManagement.Scene' how to fix?

Question

Unity

I'm trying to make sure that the sound in my game is for 3 scenes. Found instructions.
https://docs.unity3d.com/ScriptReference/Object.Do... Everything is fine with the destroid, the music plays, but there are wild problems with the first superscript. Here is the script itself
using UnityEngine;
using UnityEngine.SceneManagement;

public class SceneSwap : MonoBehaviour
{
private void OnGUI()
{
int xCenter = (Screen.width / 2);
int yCenter = (Screen.height / 2);
int width = 400;
int height = 120;

GUIStyle fontSize = new GUIStyle(GUI.skin.GetStyle("button"));
fontSize.fontSize = 32;

Scene scene = SceneManager.GetActiveScene();

if (scene.name == "scene1")
{
// Show a button to allow scene2 to be switched to.
if (GUI.Button(new Rect(xCenter - width / 2, yCenter - height / 2, width, height), "Load second scene", fontSize))
{
SceneManager.LoadScene("scene2");
}
}
else
{
// Show a button to allow scene1 to be returned to.
if (GUI.Button(new Rect(xCenter - width / 2, yCenter - height / 2, width, height), "Return to first scene", fontSize))
{
SceneManager.
}
}
}
}
Error Unable to implicitly convert the type "UnityEngine.SceneManagement.Scene"
And I suppose if you fix it and hang it at the beginning and end, then the song will stop? new music for each scene is not the point)