How to have music not restart between scenes?

Helle people, I am making a 2D game in which I created a Main Menu but I really don't want to get involved with GUI, so my menu contains multiple scenes.

I wanted my music to continue through my menu scenes so I've created a DontDestroyOnLoad script.

Now my problem is that when i get into another menu scene and come back to the first one, my music still plays, but a new one is there too(The one that comes with the scene)! I've tried to use the "audio.isPlaying" to stop music from starting if there is any sound playing but when I come to the menu for the first time it won't play at all.

What I want you to help me with is : How can I make my music continue through scenes but not to play a second time when I come back to the main page