How to fix Audio Source issue in Unity?

Question

Unity

The problem is:

public void Update()
    {
        if(GameTime == 0)
        {
            Media.Play();
        }
    }

The sound does not play, it seems to me that the problem is that I use Update. But otherwise I can't.
What I need: when the time ("GameTime") is 0, then the sound should be played (in my case, it's just music).
Music does not play for me when GameTime = 0 (In other methods like Start, music is played, only it does not work in Update).
Any ideas on this, if you need clarification, ask.
Do you have any ideas or

Answer 1

if(GameTime == 0)
{
  if(!Media.isPlaying)
  {
   Media.Play();
  }
}

Answer 2

I would hang up on the event, when GameTime = 0 call an event that will start your music.
Another option, a variable, such as isMediaPlay, as short as you can think of, and when GameTime == 0 && !isMediaPlay play music. But to hang it in the update, as for me, is ugly.