working

Project/Assets/ML-Agents/Examples/FPS_Game/Scenes/FPS_Game.unity

   m_Component:
   - component: {fileID: 134432280}
   - component: {fileID: 134432281}
+  - component: {fileID: 134432282}
   m_Layer: 0
   m_Name: Music
   m_TagString: Untagged
     m_PreInfinity: 2
     m_PostInfinity: 2
     m_RotationOrder: 4
+--- !u!114 &134432282
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 134432279}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: acf18f73005f24559bad430f9e4a9ca8, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
 --- !u!1 &135646763
 GameObject:
   m_ObjectHideFlags: 0
   BlueSpawn: {fileID: 1669694872}
   PurpleSpawn: {fileID: 247758844}
   SpawnPlayer: 0
-  SpawnBaddies: 0
+  SpawnBaddies: 1
   PlayerPrefab: {fileID: 7796409947774005658, guid: a0e7db83e097b4a3e96a89b390d1ebed,
     type: 3}
   AIPrefab: {fileID: 3775793887401821308, guid: 6a2f6d60e715b493dad52cc5c9fd1e71,

Project/Assets/ML-Agents/Examples/FPS_Game/Scripts/PlayBackgroundAudio.cs

 public class PlayBackgroundAudio : MonoBehaviour
 {
 
-    public AudioClip BackgroundSong;
+    //    public AudioClip BackgroundSong;
+        DontDestroyOnLoad(gameObject);
+
         if (m_AudioSource == null)
         {
             m_AudioSource = GetComponent<AudioSource>();
 
     void Start()
     {
-        if (BackgroundSong)
-        {
-            m_AudioSource.clip = BackgroundSong;
-            m_AudioSource.Play();
-        }
+        //        if (BackgroundSong)
+        //        {
+        //            m_AudioSource.clip = BackgroundSong;
+        m_AudioSource.Play();
+        //        }
     }
 
     // Update is called once per frame