How do I make music play during a cutscene, then make a different one play after it?

So I was making an RPG with a cutscene, and I can't get different music to play during or after a cutscene. The only cutscene I have is the one when you join, so needing to make it play more than once is out of the question. Here is my code:

`cutscene = script.Parent.Parent.PlayerGUI.Cutscene

mainMusic = script.Parent.Parent.PlayerGUI.MainMusic

if cutscene.isPlaying then

    wait(1)

    print "Playing"

else

    mainMusic.Playing = true

end

--LocalScript is in StarterPack --Music is in StarterGUI, which is linked to PlayerGUI`

So basically, it won't print "Playing", and it won't play mainMusic either.

Cutscene music isn't looped. mainMusic is, Please help!!!

Can you give me the code, and explain it so i can use it quick, but can do again later?