PlayScheduled or PlayDelayed

I have a countdown in my game, and I have a crescendo music clip of 2 mins long that I want to begin playing so it ends exactly at the end of the countdown. So I should start playing this audio clip 2 mins away from the countdown. But I have two questions on doing this…

1) The timing needs to be specific for this and I've heard certain uses of audio can be imprecise. I've found PlayScheduled and PlayDelayed but they seem to do the same thing, or am I misinterpreting the documentation? Which one is better to use in my case?

2) In the case the game length is below the 2 min length of the track, I would need to skip forward in the music track and begin playing it as soon as the game begins. Again I worry about the impreciseness of how to do things in this case. Does anyone know a way to do this?