Remote Event prints "nil" instead of IntValue I fired with it?

The problem is, GUIObject.MouseButton1Click doesn't call the connecting function with anything.. however, in your (LocalScript) code on line 12, the function that handles the MouseButton1Click has 2 arguments, therefore, both arguments will be nil once the event fires.

also, whenever a LocalScript does RemoteEvent:FireServer, the OnServerEvent handling functions will be called with the player that called FireServer and then all other arguments that you pass to it.. therefore, you don't need to pass player to FireServer, roblox automatically does it for you

EDIT:

LocalScript

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local revent = ReplicatedStorage.SoundEvent
local frame = script.Parent
local song1 = frame.song1
local cooldown = 7
local debounce = false
local song1id = 2518263386--This is what I want the normal script to print just to test.
local player = game.Players.LocalPlayer


song1.MouseButton1Click:Connect(function()
	if not debounce then 
		debounce = true
		revent:FireServer(song1id)--I fire the songid too.
		wait(cooldown)
		debounce = false
	end
end)

Server Side

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local revent = ReplicatedStorage.SoundEvent
local soundbox = script.Parent.Sound
local audio = script.Parent.Sound.SoundId



function test(player,song1id)
	audio = song1id
	print(song1id)
end

revent.OnServerEvent:Connect(test)