Stupid Mistakes

local Player = game:GetService("Players").biljana675
local Character = Player.Character
local Torso = Character.Torso
local Sound = Instance.new("Sound",Torso)
local Play = false
local Pause = false
local Loop = false
local Beat = .8

p = game:GetService('Players').LocalPlayer
p.Chatted:connect(function(msg)
        if msg:sub(1,5):lower()=='play/' then
                Play = true
                local val = Instance.new("NumberValue", p.Character)
                val.Name = "Song"
                val.Value = tonumber(msg:sub(6))
                local id = val.Value
                Sound:Stop()
                Sound.SoundId='rbxassetid://'..id
                Sound:Play()
                wait(1)
                val:Remove()

        elseif msg:sub(1,5):lower()=='pitch/' then
                local val = Instance.new("NumberValue", p.Character)
                val.Name = "Pitch"
                val.Value = tonumber(msg:sub(6))
                local Pitch = val.Value
                Sound.Pitch = Pitch
                val:Remove()
               elseif msg:sub(1,4):lower()=='vol/' then
                local val = Instance.new("NumberValue", p.Character)
                val.Name = "Vol"
                val.Value = tonumber(msg:sub(5))
                if val.Value > 10 then val.Value = math.huge
                end
                local id = val.Value
                Sound.Volume = id
                val:Remove()
        elseif msg:sub(1,5) == 'stop/' then
                Play = false
                    Sound:Stop()
        end

end)

function Random(num)
    local section=num % 1 * 3;
    local secondary=0.5 * math.pi * (section % 1);
    if section < 1 then
        return 1,1 - math.cos(secondary),1 - math.sin(secondary);
    elseif section < 2 then
        return 1 - math.sin(secondary),1,1 - math.cos(secondary);
    else
        return 1 - math.cos(secondary),1 - math.sin(secondary),1;
    end
end

local Part = Instance.new("Part",Torso)
Part.BrickColor = BrickColor.new("Really black")
Part.Anchored = true
Part.CanCollide = false
Part.TopSurface = 'Smooth'
Part.Material = Enum.Material.Neon
Part.Transparency = 0
local SelectionBox = Instance.new("SelectionBox",Part)
SelectionBox.Adornee = Part
SelectionBox.LineThickness = .009
local a = 0
game:GetService('RunService').Heartbeat(function()

    SelectionBox.Color = BrickColor.new(Random(tick()))
    local Beats = Sound.PlaybackLoudness/60 * Beat
a=a+.1
    Part.Size = Vector3.new(6+Beats ,.1 ,6+Beats)
    Part.CFrame = Torso.CFrame * CFrame.new(0,-3,0) * CFrame.Angles(0,a,0)

end)