How can I make audio play if the players goes high enough?

Hi, I'm trying to make a space game like KSP. I want to make space currently, I want to know how I can make everything else from spawn disappear and make the earth appear plus playing music and setting skybox to space.

I know, this is just one script for music, but I think I can do the sky myself.

local plr = game.Players.LocalPlayer
local char = plr.Character


while true do
	wait(.01)
	if char.Position.Y >= 19700 then
		workspace.Space:Play()
	else
		workspace.Space:Stop()
	end
end